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library_wasi.js
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154 lines (144 loc) · 5.05 KB
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/*
* Copyright 2019 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
var WasiLibrary = {
proc_exit__deps: ['exit'],
proc_exit__sig: 'vi',
proc_exit: function(code) {
_exit(code);
},
emscripten_get_environ__deps: ['$ENV', '_getExecutableName'],
emscripten_get_environ__sig: 'i',
emscripten_get_environ: function() {
if (!_emscripten_get_environ.strings) {
// Default values.
var env = {
'USER': 'web_user',
'LOGNAME': 'web_user',
'PATH': '/',
'PWD': '/',
'HOME': '/home/web_user',
// Browser language detection #8751
'LANG': ((typeof navigator === 'object' && navigator.languages && navigator.languages[0]) || 'C').replace('-', '_') + '.UTF-8',
'_': __getExecutableName()
};
// Apply the user-provided values, if any.
for (var x in ENV) {
env[x] = ENV[x];
}
var strings = [];
for (var x in env) {
strings.push(x + '=' + env[x]);
}
_emscripten_get_environ.strings = strings;
}
return _emscripten_get_environ.strings;
},
environ_sizes_get__deps: ['emscripten_get_environ'],
environ_sizes_get__sig: 'iii',
environ_sizes_get: function(penviron_count, penviron_buf_size) {
var strings = _emscripten_get_environ();
{{{ makeSetValue('penviron_count', 0, 'strings.length', 'i32') }}};
var bufSize = 0;
strings.forEach(function(string) {
bufSize += string.length + 1;
});
{{{ makeSetValue('penviron_buf_size', 0, 'bufSize', 'i32') }}};
return 0;
},
environ_get__deps: ['emscripten_get_environ'
#if MINIMAL_RUNTIME
, '$writeAsciiToMemory'
#endif
],
environ_get__sig: 'iii',
environ_get: function(__environ, environ_buf) {
var strings = _emscripten_get_environ();
var bufSize = 0;
strings.forEach(function(string, i) {
var ptr = environ_buf + bufSize;
{{{ makeSetValue('__environ', 'i * 4', 'ptr', 'i32') }}};
writeAsciiToMemory(string, ptr);
bufSize += string.length + 1;
});
return 0;
},
args_sizes_get__sig: 'iii',
args_sizes_get: function(pargc, pargv_buf_size) {
#if MAIN_READS_PARAMS
{{{ makeSetValue('pargc', 0, 'mainArgs.length', 'i32') }}};
var bufSize = 0;
mainArgs.forEach(function(arg) {
bufSize += arg.length + 1;
});
{{{ makeSetValue('pargv_buf_size', 0, 'bufSize', 'i32') }}};
#else
{{{ makeSetValue('pargc', 0, '0', 'i32') }}};
#endif
return 0;
},
args_get__sig: 'iii',
args_get: function(argv, argv_buf) {
#if MAIN_READS_PARAMS
var bufSize = 0;
mainArgs.forEach(function(arg, i) {
var ptr = argv_buf + bufSize;
{{{ makeSetValue('argv', 'i * 4', 'ptr', 'i32') }}};
writeAsciiToMemory(arg, ptr);
bufSize += arg.length + 1;
});
#endif
return 0;
},
// TODO: the i64 in the API here must be legalized for this JS code to run,
// but the wasm file can't be legalized in standalone mode, which is where
// this is needed. To get this code to be usable as a JS shim we need to
// either wait for BigInt support or to legalize on the client.
clock_time_get__sig: 'iiiii',
clock_time_get__deps: ['emscripten_get_now', 'emscripten_get_now_is_monotonic', '__setErrNo'],
clock_time_get: function(clk_id, precision_l, precision_h, ptime) {
var now;
if (clk_id === {{{ cDefine('__WASI_CLOCKID_REALTIME') }}}) {
now = Date.now();
} else if (clk_id === {{{ cDefine('__WASI_CLOCKID_MONOTONIC') }}} && _emscripten_get_now_is_monotonic) {
now = _emscripten_get_now();
} else {
___setErrNo({{{ cDefine('EINVAL') }}});
return -1;
}
// "now" is in ms, and wasi times are in ns.
var nsec = Math.round(now * 1000 * 1000);
{{{ makeSetValue('ptime', 0, 'nsec >>> 0', 'i32') }}};
{{{ makeSetValue('ptime', 4, '(nsec / Math.pow(2, 32)) >>> 0', 'i32') }}};
return 0;
},
clock_res_get__sig: 'iii',
clock_res_get__deps: ['emscripten_get_now', 'emscripten_get_now_is_monotonic', '__setErrNo'],
clock_res_get: function(clk_id, pres) {
var nsec;
if (clk_id === {{{ cDefine('CLOCK_REALTIME') }}}) {
nsec = 1000 * 1000; // educated guess that it's milliseconds
} else if (clk_id === {{{ cDefine('CLOCK_MONOTONIC') }}} && _emscripten_get_now_is_monotonic) {
nsec = _emscripten_get_now_res();
} else {
___setErrNo({{{ cDefine('EINVAL') }}});
return -1;
}
{{{ makeSetValue('pres', 0, 'nsec >>> 0', 'i32') }}};
{{{ makeSetValue('pres', 4, '(nsec / Math.pow(2, 32)) >>> 0', 'i32') }}};
return 0;
},
};
// Fallback for cases where the wasi_interface_version.name prefixing fails,
// and we have the full name from C. This happens in fastcomp which
// lacks the attribute to set the import module and base names.
if (!WASM_BACKEND) {
for (var x in WasiLibrary) {
if (isJsLibraryConfigIdentifier(x)) continue;
WasiLibrary['__wasi_' + x] = x;
}
}
mergeInto(LibraryManager.library, WasiLibrary);