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runtime_init_memory.js
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63 lines (58 loc) · 1.8 KB
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/**
* @license
* Copyright 2019 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
// Create the main memory. (Note: this isn't used in STANDALONE_WASM mode since the wasm
// memory is created in the wasm, not in JS.)
#if USE_PTHREADS
if (ENVIRONMENT_IS_PTHREAD) {
wasmMemory = Module['wasmMemory'];
buffer = Module['buffer'];
} else {
#endif // USE_PTHREADS
#if expectToReceiveOnModule('wasmMemory')
if (Module['wasmMemory']) {
wasmMemory = Module['wasmMemory'];
} else
#endif
{
wasmMemory = new WebAssembly.Memory({
'initial': INITIAL_MEMORY / {{{ WASM_PAGE_SIZE }}}
#if ALLOW_MEMORY_GROWTH
#if MAXIMUM_MEMORY != -1
,
'maximum': {{{ MAXIMUM_MEMORY }}} / {{{ WASM_PAGE_SIZE }}}
#endif
#else
,
'maximum': INITIAL_MEMORY / {{{ WASM_PAGE_SIZE }}}
#endif // ALLOW_MEMORY_GROWTH
#if USE_PTHREADS
,
'shared': true
#endif
});
#if USE_PTHREADS
if (!(wasmMemory.buffer instanceof SharedArrayBuffer)) {
err('requested a shared WebAssembly.Memory but the returned buffer is not a SharedArrayBuffer, indicating that while the browser has SharedArrayBuffer it does not have WebAssembly threads support - you may need to set a flag');
if (ENVIRONMENT_IS_NODE) {
console.log('(on node you may need: --experimental-wasm-threads --experimental-wasm-bulk-memory and also use a recent version)');
}
throw Error('bad memory');
}
#endif
}
#if USE_PTHREADS
}
#endif
if (wasmMemory) {
buffer = wasmMemory.buffer;
}
// If the user provides an incorrect length, just use that length instead rather than providing the user to
// specifically provide the memory length with Module['INITIAL_MEMORY'].
INITIAL_MEMORY = buffer.byteLength;
#if ASSERTIONS
assert(INITIAL_MEMORY % {{{ WASM_PAGE_SIZE }}} === 0);
#endif
updateGlobalBufferAndViews(buffer);