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preamble.js
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preamble.js
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/**
* @license
* Copyright 2010 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
// === Preamble library stuff ===
// Documentation for the public APIs defined in this file must be updated in:
// site/source/docs/api_reference/preamble.js.rst
// A prebuilt local version of the documentation is available at:
// site/build/text/docs/api_reference/preamble.js.txt
// You can also build docs locally as HTML or other formats in site/
// An online HTML version (which may be of a different version of Emscripten)
// is up at http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html
#if BENCHMARK
Module.realPrint = out;
out = err = () => {};
#endif
#if RELOCATABLE
{{{ makeModuleReceiveWithVar('dynamicLibraries', undefined, '[]', true) }}}
#endif
{{{ makeModuleReceiveWithVar('wasmBinary') }}}
{{{ makeModuleReceiveWithVar('noExitRuntime', undefined, EXIT_RUNTIME ? 'false' : 'true') }}}
#if WASM != 2 && MAYBE_WASM2JS
#if !WASM2JS
if (Module['doWasm2JS']) {
#endif
#include "wasm2js.js"
#if !WASM2JS
}
#endif
#endif
#if WASM == 1
if (typeof WebAssembly != 'object') {
abort('no native wasm support detected');
}
#endif
#if SAFE_HEAP
#include "runtime_safe_heap.js"
#endif
#if USE_ASAN
#include "runtime_asan.js"
#endif
// Wasm globals
var wasmMemory;
#if SHARED_MEMORY
// For sending to workers.
var wasmModule;
#endif // SHARED_MEMORY
//========================================
// Runtime essentials
//========================================
// whether we are quitting the application. no code should run after this.
// set in exit() and abort()
var ABORT = false;
// set by exit() and abort(). Passed to 'onExit' handler.
// NOTE: This is also used as the process return code code in shell environments
// but only when noExitRuntime is false.
var EXITSTATUS;
/** @type {function(*, string=)} */
function assert(condition, text) {
if (!condition) {
#if ASSERTIONS
abort('Assertion failed' + (text ? ': ' + text : ''));
#else
// This build was created without ASSERTIONS defined. `assert()` should not
// ever be called in this configuration but in case there are callers in
// the wild leave this simple abort() implemenation here for now.
abort(text);
#endif
}
}
#if ASSERTIONS
// We used to include malloc/free by default in the past. Show a helpful error in
// builds with assertions.
#if !hasExportedSymbol('malloc')
function _malloc() {
abort("malloc() called but not included in the build - add '_malloc' to EXPORTED_FUNCTIONS");
}
#endif // malloc
#if !hasExportedSymbol('free')
function _free() {
// Show a helpful error since we used to include free by default in the past.
abort("free() called but not included in the build - add '_free' to EXPORTED_FUNCTIONS");
}
#endif // free
#endif // ASSERTIONS
// Memory management
var HEAP,
/** @type {!Int8Array} */
HEAP8,
/** @type {!Uint8Array} */
HEAPU8,
/** @type {!Int16Array} */
HEAP16,
/** @type {!Uint16Array} */
HEAPU16,
/** @type {!Int32Array} */
HEAP32,
/** @type {!Uint32Array} */
HEAPU32,
/** @type {!Float32Array} */
HEAPF32,
#if WASM_BIGINT
/* BigInt64Array type is not correctly defined in closure
/** not-@type {!BigInt64Array} */
HEAP64,
/* BigUInt64Array type is not correctly defined in closure
/** not-t@type {!BigUint64Array} */
HEAPU64,
#endif
/** @type {!Float64Array} */
HEAPF64;
#if SUPPORT_BIG_ENDIAN
var HEAP_DATA_VIEW;
#endif
function updateMemoryViews() {
var b = wasmMemory.buffer;
#if SUPPORT_BIG_ENDIAN
Module['HEAP_DATA_VIEW'] = HEAP_DATA_VIEW = new DataView(b);
#endif
Module['HEAP8'] = HEAP8 = new Int8Array(b);
Module['HEAP16'] = HEAP16 = new Int16Array(b);
Module['HEAP32'] = HEAP32 = new Int32Array(b);
Module['HEAPU8'] = HEAPU8 = new Uint8Array(b);
Module['HEAPU16'] = HEAPU16 = new Uint16Array(b);
Module['HEAPU32'] = HEAPU32 = new Uint32Array(b);
Module['HEAPF32'] = HEAPF32 = new Float32Array(b);
Module['HEAPF64'] = HEAPF64 = new Float64Array(b);
#if WASM_BIGINT
Module['HEAP64'] = HEAP64 = new BigInt64Array(b);
Module['HEAPU64'] = HEAPU64 = new BigUint64Array(b);
#endif
}
#if ASSERTIONS
assert(!Module['STACK_SIZE'], 'STACK_SIZE can no longer be set at runtime. Use -sSTACK_SIZE at link time')
#endif
#if ASSERTIONS
assert(typeof Int32Array != 'undefined' && typeof Float64Array !== 'undefined' && Int32Array.prototype.subarray != undefined && Int32Array.prototype.set != undefined,
'JS engine does not provide full typed array support');
#endif
#if IMPORTED_MEMORY
// In non-standalone/normal mode, we create the memory here.
#include "runtime_init_memory.js"
#elif ASSERTIONS
// If memory is defined in wasm, the user can't provide it, or set INITIAL_MEMORY
assert(!Module['wasmMemory'], 'Use of `wasmMemory` detected. Use -sIMPORTED_MEMORY to define wasmMemory externally');
assert(!Module['INITIAL_MEMORY'], 'Detected runtime INITIAL_MEMORY setting. Use -sIMPORTED_MEMORY to define wasmMemory dynamically');
#endif // !IMPORTED_MEMORY && ASSERTIONS
#include "runtime_init_table.js"
#include "runtime_stack_check.js"
#include "runtime_assertions.js"
var __ATPRERUN__ = []; // functions called before the runtime is initialized
var __ATINIT__ = []; // functions called during startup
#if HAS_MAIN
var __ATMAIN__ = []; // functions called when main() is to be run
#endif
var __ATEXIT__ = []; // functions called during shutdown
var __ATPOSTRUN__ = []; // functions called after the main() is called
#if RELOCATABLE
var __RELOC_FUNCS__ = [];
#endif
var runtimeInitialized = false;
#if EXIT_RUNTIME
var runtimeExited = false;
#endif
var runtimeKeepaliveCounter = 0;
function keepRuntimeAlive() {
return noExitRuntime || runtimeKeepaliveCounter > 0;
}
function preRun() {
#if ASSERTIONS && PTHREADS
assert(!ENVIRONMENT_IS_PTHREAD); // PThreads reuse the runtime from the main thread.
#endif
#if expectToReceiveOnModule('preRun')
if (Module['preRun']) {
if (typeof Module['preRun'] == 'function') Module['preRun'] = [Module['preRun']];
while (Module['preRun'].length) {
addOnPreRun(Module['preRun'].shift());
}
}
#endif
callRuntimeCallbacks(__ATPRERUN__);
}
function initRuntime() {
#if ASSERTIONS
assert(!runtimeInitialized);
#endif
runtimeInitialized = true;
#if WASM_WORKERS
if (ENVIRONMENT_IS_WASM_WORKER) return _wasmWorkerInitializeRuntime();
#endif
#if PTHREADS
if (ENVIRONMENT_IS_PTHREAD) return;
#endif
#if STACK_OVERFLOW_CHECK
checkStackCookie();
#endif
#if STACK_OVERFLOW_CHECK >= 2
#if RUNTIME_LOGGING
err('__set_stack_limits: ' + _emscripten_stack_get_base() + ', ' + _emscripten_stack_get_end());
#endif
___set_stack_limits(_emscripten_stack_get_base(), _emscripten_stack_get_end());
#endif
#if RELOCATABLE
callRuntimeCallbacks(__RELOC_FUNCS__);
#endif
<<< ATINITS >>>
callRuntimeCallbacks(__ATINIT__);
}
#if HAS_MAIN
function preMain() {
#if STACK_OVERFLOW_CHECK
checkStackCookie();
#endif
#if PTHREADS
if (ENVIRONMENT_IS_PTHREAD) return; // PThreads reuse the runtime from the main thread.
#endif
<<< ATMAINS >>>
callRuntimeCallbacks(__ATMAIN__);
}
#endif
#if EXIT_RUNTIME
function exitRuntime() {
#if RUNTIME_DEBUG
dbg('exitRuntime');
#endif
#if ASSERTIONS
assert(!runtimeExited);
#endif
#if ASYNCIFY == 1 && ASSERTIONS
// ASYNCIFY cannot be used once the runtime starts shutting down.
Asyncify.state = Asyncify.State.Disabled;
#endif
#if STACK_OVERFLOW_CHECK
checkStackCookie();
#endif
#if PTHREADS
if (ENVIRONMENT_IS_PTHREAD) return; // PThreads reuse the runtime from the main thread.
#endif
#if !STANDALONE_WASM
___funcs_on_exit(); // Native atexit() functions
#endif
callRuntimeCallbacks(__ATEXIT__);
<<< ATEXITS >>>
#if PTHREADS
PThread.terminateAllThreads();
#endif
runtimeExited = true;
}
#endif
function postRun() {
#if STACK_OVERFLOW_CHECK
checkStackCookie();
#endif
#if PTHREADS
if (ENVIRONMENT_IS_PTHREAD) return; // PThreads reuse the runtime from the main thread.
#endif
#if expectToReceiveOnModule('postRun')
if (Module['postRun']) {
if (typeof Module['postRun'] == 'function') Module['postRun'] = [Module['postRun']];
while (Module['postRun'].length) {
addOnPostRun(Module['postRun'].shift());
}
}
#endif
callRuntimeCallbacks(__ATPOSTRUN__);
}
function addOnPreRun(cb) {
__ATPRERUN__.unshift(cb);
}
function addOnInit(cb) {
__ATINIT__.unshift(cb);
}
#if HAS_MAIN
function addOnPreMain(cb) {
__ATMAIN__.unshift(cb);
}
#endif
function addOnExit(cb) {
#if EXIT_RUNTIME
__ATEXIT__.unshift(cb);
#endif
}
function addOnPostRun(cb) {
__ATPOSTRUN__.unshift(cb);
}
#include "runtime_math.js"
// A counter of dependencies for calling run(). If we need to
// do asynchronous work before running, increment this and
// decrement it. Incrementing must happen in a place like
// Module.preRun (used by emcc to add file preloading).
// Note that you can add dependencies in preRun, even though
// it happens right before run - run will be postponed until
// the dependencies are met.
var runDependencies = 0;
var runDependencyWatcher = null;
var dependenciesFulfilled = null; // overridden to take different actions when all run dependencies are fulfilled
#if ASSERTIONS
var runDependencyTracking = {};
#endif
function getUniqueRunDependency(id) {
#if ASSERTIONS
var orig = id;
while (1) {
if (!runDependencyTracking[id]) return id;
id = orig + Math.random();
}
#else
return id;
#endif
}
function addRunDependency(id) {
runDependencies++;
#if expectToReceiveOnModule('monitorRunDependencies')
if (Module['monitorRunDependencies']) {
Module['monitorRunDependencies'](runDependencies);
}
#endif
#if ASSERTIONS
if (id) {
assert(!runDependencyTracking[id]);
runDependencyTracking[id] = 1;
if (runDependencyWatcher === null && typeof setInterval != 'undefined') {
// Check for missing dependencies every few seconds
runDependencyWatcher = setInterval(() => {
if (ABORT) {
clearInterval(runDependencyWatcher);
runDependencyWatcher = null;
return;
}
var shown = false;
for (var dep in runDependencyTracking) {
if (!shown) {
shown = true;
err('still waiting on run dependencies:');
}
err('dependency: ' + dep);
}
if (shown) {
err('(end of list)');
}
}, 10000);
}
} else {
err('warning: run dependency added without ID');
}
#endif
}
function removeRunDependency(id) {
runDependencies--;
#if expectToReceiveOnModule('monitorRunDependencies')
if (Module['monitorRunDependencies']) {
Module['monitorRunDependencies'](runDependencies);
}
#endif
#if ASSERTIONS
if (id) {
assert(runDependencyTracking[id]);
delete runDependencyTracking[id];
} else {
err('warning: run dependency removed without ID');
}
#endif
if (runDependencies == 0) {
if (runDependencyWatcher !== null) {
clearInterval(runDependencyWatcher);
runDependencyWatcher = null;
}
if (dependenciesFulfilled) {
var callback = dependenciesFulfilled;
dependenciesFulfilled = null;
callback(); // can add another dependenciesFulfilled
}
}
}
/** @param {string|number=} what */
function abort(what) {
#if expectToReceiveOnModule('onAbort')
if (Module['onAbort']) {
Module['onAbort'](what);
}
#endif
what = 'Aborted(' + what + ')';
// TODO(sbc): Should we remove printing and leave it up to whoever
// catches the exception?
err(what);
ABORT = true;
EXITSTATUS = 1;
#if ASSERTIONS == 0
what += '. Build with -sASSERTIONS for more info.';
#elif ASYNCIFY == 1
if (what.indexOf('RuntimeError: unreachable') >= 0) {
what += '. "unreachable" may be due to ASYNCIFY_STACK_SIZE not being large enough (try increasing it)';
}
#endif // ASSERTIONS
// Use a wasm runtime error, because a JS error might be seen as a foreign
// exception, which means we'd run destructors on it. We need the error to
// simply make the program stop.
// FIXME This approach does not work in Wasm EH because it currently does not assume
// all RuntimeErrors are from traps; it decides whether a RuntimeError is from
// a trap or not based on a hidden field within the object. So at the moment
// we don't have a way of throwing a wasm trap from JS. TODO Make a JS API that
// allows this in the wasm spec.
// Suppress closure compiler warning here. Closure compiler's builtin extern
// defintion for WebAssembly.RuntimeError claims it takes no arguments even
// though it can.
// TODO(https://github.com/google/closure-compiler/pull/3913): Remove if/when upstream closure gets fixed.
#if WASM_EXCEPTIONS == 1
// See above, in the meantime, we resort to wasm code for trapping.
//
// In case abort() is called before the module is initialized, Module['asm']
// and its exported '__trap' function is not available, in which case we throw
// a RuntimeError.
//
// We trap instead of throwing RuntimeError to prevent infinite-looping in
// Wasm EH code (because RuntimeError is considered as a foreign exception and
// caught by 'catch_all'), but in case throwing RuntimeError is fine because
// the module has not even been instantiated, even less running.
if (runtimeInitialized) {
___trap();
}
#endif
/** @suppress {checkTypes} */
var e = new WebAssembly.RuntimeError(what);
#if MODULARIZE
readyPromiseReject(e);
#endif
// Throw the error whether or not MODULARIZE is set because abort is used
// in code paths apart from instantiation where an exception is expected
// to be thrown when abort is called.
throw e;
}
#include "memoryprofiler.js"
#if ASSERTIONS && !('$FS' in addedLibraryItems) && !WASMFS
// show errors on likely calls to FS when it was not included
var FS = {
error: function() {
abort('Filesystem support (FS) was not included. The problem is that you are using files from JS, but files were not used from C/C++, so filesystem support was not auto-included. You can force-include filesystem support with -sFORCE_FILESYSTEM');
},
init: function() { FS.error() },
createDataFile: function() { FS.error() },
createPreloadedFile: function() { FS.error() },
createLazyFile: function() { FS.error() },
open: function() { FS.error() },
mkdev: function() { FS.error() },
registerDevice: function() { FS.error() },
analyzePath: function() { FS.error() },
ErrnoError: function ErrnoError() { FS.error() },
};
Module['FS_createDataFile'] = FS.createDataFile;
Module['FS_createPreloadedFile'] = FS.createPreloadedFile;
#endif
#include "URIUtils.js"
#if ASSERTIONS
/** @param {boolean=} fixedasm */
function createExportWrapper(name, fixedasm) {
return function() {
var displayName = name;
var asm = fixedasm;
if (!fixedasm) {
asm = Module['asm'];
}
assert(runtimeInitialized, 'native function `' + displayName + '` called before runtime initialization');
#if EXIT_RUNTIME
assert(!runtimeExited, 'native function `' + displayName + '` called after runtime exit (use NO_EXIT_RUNTIME to keep it alive after main() exits)');
#endif
if (!asm[name]) {
assert(asm[name], 'exported native function `' + displayName + '` not found');
}
return asm[name].apply(null, arguments);
};
}
#endif
#include "runtime_exceptions.js"
#if ABORT_ON_WASM_EXCEPTIONS
// `abortWrapperDepth` counts the recursion level of the wrapper function so
// that we only handle exceptions at the top level letting the exception
// mechanics work uninterrupted at the inner level. Additionally,
// `abortWrapperDepth` is also manually incremented in callMain so that we know
// to ignore exceptions from there since they're handled by callMain directly.
var abortWrapperDepth = 0;
// Creates a wrapper in a closure so that each wrapper gets it's own copy of 'original'
function makeAbortWrapper(original) {
return function() {
// Don't allow this function to be called if we're aborted!
if (ABORT) {
throw "program has already aborted!";
}
abortWrapperDepth += 1;
try {
return original.apply(null, arguments);
} catch (e) {
if (
ABORT // rethrow exception if abort() was called in the original function call above
|| abortWrapperDepth > 1 // rethrow exceptions not caught at the top level if exception catching is enabled; rethrow from exceptions from within callMain
#if SUPPORT_LONGJMP == 'emscripten' // Rethrow longjmp if enabled
#if EXCEPTION_STACK_TRACES
|| e instanceof EmscriptenSjLj // EXCEPTION_STACK_TRACES=1 will throw an instance of EmscriptenSjLj
#else
|| e === Infinity // EXCEPTION_STACK_TRACES=0 will throw Infinity
#endif // EXCEPTION_STACK_TRACES
#endif
|| e === 'unwind'
) {
throw e;
}
abort("unhandled exception: " + [e, e.stack]);
}
finally {
abortWrapperDepth -= 1;
}
}
}
// Instrument all the exported functions to:
// - abort if an unhandled exception occurs
// - throw an exception if someone tries to call them after the program has aborted
// See settings.ABORT_ON_WASM_EXCEPTIONS for more info.
function instrumentWasmExportsWithAbort(exports) {
// Override the exported functions with the wrappers and copy over any other symbols
var instExports = {};
for (var name in exports) {
var original = exports[name];
if (typeof original == 'function') {
instExports[name] = makeAbortWrapper(original);
} else {
instExports[name] = original;
}
}
return instExports;
}
function instrumentWasmTableWithAbort() {
// Override the wasmTable get function to return the wrappers
var realGet = wasmTable.get;
var wrapperCache = {};
wasmTable.get = (i) => {
var func = realGet.call(wasmTable, i);
var cached = wrapperCache[i];
if (!cached || cached.func !== func) {
cached = wrapperCache[i] = {
func: func,
wrapper: makeAbortWrapper(func)
}
}
return cached.wrapper;
};
}
#endif
var wasmBinaryFile;
#if EXPORT_ES6 && USE_ES6_IMPORT_META && !SINGLE_FILE
if (Module['locateFile']) {
#endif
wasmBinaryFile = '{{{ WASM_BINARY_FILE }}}';
if (!isDataURI(wasmBinaryFile)) {
wasmBinaryFile = locateFile(wasmBinaryFile);
}
#if EXPORT_ES6 && USE_ES6_IMPORT_META && !SINGLE_FILE // in single-file mode, repeating WASM_BINARY_FILE would emit the contents again
} else {
// Use bundler-friendly `new URL(..., import.meta.url)` pattern; works in browsers too.
wasmBinaryFile = new URL('{{{ WASM_BINARY_FILE }}}', import.meta.url).href;
}
#endif
function getBinary(file) {
try {
if (file == wasmBinaryFile && wasmBinary) {
return new Uint8Array(wasmBinary);
}
#if SUPPORT_BASE64_EMBEDDING
var binary = tryParseAsDataURI(file);
if (binary) {
return binary;
}
#endif
if (readBinary) {
return readBinary(file);
}
#if WASM_ASYNC_COMPILATION
throw "both async and sync fetching of the wasm failed";
#else
throw "sync fetching of the wasm failed: you can preload it to Module['wasmBinary'] manually, or emcc.py will do that for you when generating HTML (but not JS)";
#endif
}
catch (err) {
abort(err);
}
}
function getBinaryPromise(binaryFile) {
// If we don't have the binary yet, try to load it asynchronously.
// Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
// See https://github.com/github/fetch/pull/92#issuecomment-140665932
// Cordova or Electron apps are typically loaded from a file:// url.
// So use fetch if it is available and the url is not a file, otherwise fall back to XHR.
if (!wasmBinary && (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER)) {
if (typeof fetch == 'function'
#if ENVIRONMENT_MAY_BE_WEBVIEW
&& !isFileURI(binaryFile)
#endif
) {
return fetch(binaryFile, {{{ makeModuleReceiveExpr('fetchSettings', "{ credentials: 'same-origin' }") }}}).then((response) => {
if (!response['ok']) {
throw "failed to load wasm binary file at '" + binaryFile + "'";
}
return response['arrayBuffer']();
}).catch(() => getBinary(binaryFile));
}
#if ENVIRONMENT_MAY_BE_WEBVIEW
else {
if (readAsync) {
// fetch is not available or url is file => try XHR (readAsync uses XHR internally)
return new Promise((resolve, reject) => {
readAsync(binaryFile, (response) => resolve(new Uint8Array(/** @type{!ArrayBuffer} */(response))), reject)
});
}
}
#endif
}
// Otherwise, getBinary should be able to get it synchronously
return Promise.resolve().then(() => getBinary(binaryFile));
}
#if LOAD_SOURCE_MAP
var wasmSourceMap;
#include "source_map_support.js"
#endif
#if USE_OFFSET_CONVERTER
var wasmOffsetConverter;
#include "wasm_offset_converter.js"
#endif
#if SPLIT_MODULE
{{{ makeModuleReceiveWithVar('loadSplitModule', undefined, 'instantiateSync', true) }}}
var splitModuleProxyHandler = {
'get': function(target, prop, receiver) {
return function() {
#if ASYNCIFY == 2
throw new Error('Placeholder function "' + prop + '" should not be called when using JSPI.');
#else
err('placeholder function called: ' + prop);
var imports = {'primary': Module['asm']};
// Replace '.wasm' suffix with '.deferred.wasm'.
var deferred = wasmBinaryFile.slice(0, -5) + '.deferred.wasm'
loadSplitModule(deferred, imports, prop);
err('instantiated deferred module, continuing');
#if RELOCATABLE
// When the table is dynamically laid out, the placeholder functions names
// are offsets from the table base. In the main module, the table base is
// always 1.
return wasmTable.get(1 + parseInt(prop)).apply(null, arguments);
#else
return wasmTable.get(prop).apply(null, arguments);
#endif
#endif
}
}
};
#endif
#if LOAD_SOURCE_MAP
function receiveSourceMapJSON(sourceMap) {
wasmSourceMap = new WasmSourceMap(sourceMap);
{{{ runIfMainThread("removeRunDependency('source-map');") }}}
}
#endif
#if SPLIT_MODULE || !WASM_ASYNC_COMPILATION
function instantiateSync(file, info) {
var instance;
var module;
var binary;
try {
binary = getBinary(file);
#if NODE_CODE_CACHING
if (ENVIRONMENT_IS_NODE) {
var v8 = require('v8');
// Include the V8 version in the cache name, so that we don't try to
// load cached code from another version, which fails silently (it seems
// to load ok, but we do actually recompile the binary every time).
var cachedCodeFile = '{{{ WASM_BINARY_FILE }}}.' + v8.cachedDataVersionTag() + '.cached';
cachedCodeFile = locateFile(cachedCodeFile);
var hasCached = fs.existsSync(cachedCodeFile);
if (hasCached) {
#if RUNTIME_LOGGING
err('NODE_CODE_CACHING: loading module');
#endif
try {
module = v8.deserialize(fs.readFileSync(cachedCodeFile));
} catch (e) {
err('NODE_CODE_CACHING: failed to deserialize, bad cache file? (' + cachedCodeFile + ')');
// Save the new compiled code when we have it.
hasCached = false;
}
}
}
if (!module) {
module = new WebAssembly.Module(binary);
}
if (ENVIRONMENT_IS_NODE && !hasCached) {
#if RUNTIME_LOGGING
err('NODE_CODE_CACHING: saving module');
#endif
fs.writeFileSync(cachedCodeFile, v8.serialize(module));
}
#else // NODE_CODE_CACHING
module = new WebAssembly.Module(binary);
#endif // NODE_CODE_CACHING
instance = new WebAssembly.Instance(module, info);
#if USE_OFFSET_CONVERTER
wasmOffsetConverter = new WasmOffsetConverter(binary, module);
#endif
} catch (e) {
var str = e.toString();
err('failed to compile wasm module: ' + str);
if (str.includes('imported Memory') ||
str.includes('memory import')) {
err('Memory size incompatibility issues may be due to changing INITIAL_MEMORY at runtime to something too large. Use ALLOW_MEMORY_GROWTH to allow any size memory (and also make sure not to set INITIAL_MEMORY at runtime to something smaller than it was at compile time).');
}
throw e;
}
#if LOAD_SOURCE_MAP
receiveSourceMapJSON(getSourceMap());
#endif
return [instance, module];
}
#endif
#if PTHREADS && (LOAD_SOURCE_MAP || USE_OFFSET_CONVERTER)
// When using postMessage to send an object, it is processed by the structured
// clone algorithm. The prototype, and hence methods, on that object is then
// lost. This function adds back the lost prototype. This does not work with
// nested objects that has prototypes, but it suffices for WasmSourceMap and
// WasmOffsetConverter.
function resetPrototype(constructor, attrs) {
var object = Object.create(constructor.prototype);
return Object.assign(object, attrs);
}
#endif
#if WASM_ASYNC_COMPILATION
function instantiateArrayBuffer(binaryFile, imports, receiver) {
#if USE_OFFSET_CONVERTER
var savedBinary;
#endif
return getBinaryPromise(binaryFile).then((binary) => {
#if USE_OFFSET_CONVERTER
savedBinary = binary;
#endif
return WebAssembly.instantiate(binary, imports);
}).then((instance) => {
#if USE_OFFSET_CONVERTER
// wasmOffsetConverter needs to be assigned before calling the receiver
// (receiveInstantiationResult). See comments below in instantiateAsync.
wasmOffsetConverter = new WasmOffsetConverter(savedBinary, instance.module);
#endif
return instance;
}).then(receiver, (reason) => {
err('failed to asynchronously prepare wasm: ' + reason);
#if WASM == 2
#if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL
if (typeof location != 'undefined') {
#endif
// WebAssembly compilation failed, try running the JS fallback instead.
var search = location.search;
if (search.indexOf('_rwasm=0') < 0) {
location.href += (search ? search + '&' : '?') + '_rwasm=0';
// Return here to avoid calling abort() below. The application
// still has a chance to start sucessfully do we don't want to
// trigger onAbort or onExit handlers.
return;
}
#if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL
}
#endif
#endif // WASM == 2
#if ASSERTIONS
// Warn on some common problems.
if (isFileURI(wasmBinaryFile)) {
err('warning: Loading from a file URI (' + wasmBinaryFile + ') is not supported in most browsers. See https://emscripten.org/docs/getting_started/FAQ.html#how-do-i-run-a-local-webserver-for-testing-why-does-my-program-stall-in-downloading-or-preparing');
}
#endif
abort(reason);
});
}
function instantiateAsync(binary, binaryFile, imports, callback) {
if (!binary &&
typeof WebAssembly.instantiateStreaming == 'function' &&
!isDataURI(binaryFile) &&
#if ENVIRONMENT_MAY_BE_WEBVIEW
// Don't use streaming for file:// delivered objects in a webview, fetch them synchronously.
!isFileURI(binaryFile) &&
#endif
#if ENVIRONMENT_MAY_BE_NODE
// Avoid instantiateStreaming() on Node.js environment for now, as while
// Node.js v18.1.0 implements it, it does not have a full fetch()
// implementation yet.
//
// Reference:
// https://github.com/emscripten-core/emscripten/pull/16917
!ENVIRONMENT_IS_NODE &&
#endif
typeof fetch == 'function') {
return fetch(binaryFile, {{{ makeModuleReceiveExpr('fetchSettings', "{ credentials: 'same-origin' }") }}}).then((response) => {
// Suppress closure warning here since the upstream definition for
// instantiateStreaming only allows Promise<Repsponse> rather than
// an actual Response.
// TODO(https://github.com/google/closure-compiler/pull/3913): Remove if/when upstream closure is fixed.
/** @suppress {checkTypes} */
var result = WebAssembly.instantiateStreaming(response, imports);
#if USE_OFFSET_CONVERTER
// We need the wasm binary for the offset converter. Clone the response
// in order to get its arrayBuffer (cloning should be more efficient
// than doing another entire request).
// (We must clone the response now in order to use it later, as if we
// try to clone it asynchronously lower down then we will get a
// "response was already consumed" error.)
var clonedResponsePromise = response.clone().arrayBuffer();
#endif
return result.then(
#if !USE_OFFSET_CONVERTER
callback,
#else
function(instantiationResult) {
// When using the offset converter, we must interpose here. First,
// the instantiation result must arrive (if it fails, the error
// handling later down will handle it). Once it arrives, we can
// initialize the offset converter. And only then is it valid to
// call receiveInstantiationResult, as that function will use the
// offset converter (in the case of pthreads, it will create the
// pthreads and send them the offsets along with the wasm instance).
clonedResponsePromise.then((arrayBufferResult) => {
wasmOffsetConverter = new WasmOffsetConverter(new Uint8Array(arrayBufferResult), instantiationResult.module);
callback(instantiationResult);
},
(reason) => err('failed to initialize offset-converter: ' + reason)
);
},
#endif
function(reason) {
// We expect the most common failure cause to be a bad MIME type for the binary,
// in which case falling back to ArrayBuffer instantiation should work.
err('wasm streaming compile failed: ' + reason);
err('falling back to ArrayBuffer instantiation');
return instantiateArrayBuffer(binaryFile, imports, callback);
});
});
} else {
return instantiateArrayBuffer(binaryFile, imports, callback);
}
}
#endif // WASM_ASYNC_COMPILATION
// Create the wasm instance.
// Receives the wasm imports, returns the exports.
function createWasm() {
// prepare imports
var info = {
#if MINIFY_WASM_IMPORTED_MODULES
'a': wasmImports,
#else // MINIFY_WASM_IMPORTED_MODULES
'env': wasmImports,
'{{{ WASI_MODULE_NAME }}}': wasmImports,
#endif // MINIFY_WASM_IMPORTED_MODULES
#if SPLIT_MODULE
'placeholder': new Proxy({}, splitModuleProxyHandler),
#endif
#if RELOCATABLE
'GOT.mem': new Proxy(wasmImports, GOTHandler),
'GOT.func': new Proxy(wasmImports, GOTHandler),
#endif
};
// Load the wasm module and create an instance of using native support in the JS engine.
// handle a generated wasm instance, receiving its exports and
// performing other necessary setup
/** @param {WebAssembly.Module=} module*/
function receiveInstance(instance, module) {
var exports = instance.exports;
#if RELOCATABLE
exports = relocateExports(exports, {{{ GLOBAL_BASE }}});
#endif
#if ASYNCIFY
exports = Asyncify.instrumentWasmExports(exports);
#endif
#if ABORT_ON_WASM_EXCEPTIONS
exports = instrumentWasmExportsWithAbort(exports);
#endif
#if MAIN_MODULE
var metadata = getDylinkMetadata(module);
#if AUTOLOAD_DYLIBS
if (metadata.neededDynlibs) {
dynamicLibraries = metadata.neededDynlibs.concat(dynamicLibraries);
}
#endif
mergeLibSymbols(exports, 'main')
#endif
#if MEMORY64
exports = instrumentWasmExportsForMemory64(exports);
#endif
Module['asm'] = exports;
#if PTHREADS
#if MAIN_MODULE
registerTLSInit(Module['asm']['_emscripten_tls_init'], instance.exports, metadata);
#else
registerTLSInit(Module['asm']['_emscripten_tls_init']);
#endif
#endif
#if !IMPORTED_MEMORY
wasmMemory = Module['asm']['memory'];