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 atobie

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runtime_stack_check.js

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/**

* @license

* Copyright 2019 The Emscripten Authors

* SPDX-License-Identifier: MIT

*/

#if STACK_OVERFLOW_CHECK

// Initializes the stack cookie. Called at the startup of main and at the startup of each thread in pthreads mode.

function writeStackCookie() {

var max = _emscripten_stack_get_end();

#if ASSERTIONS

assert((max & 3) == 0);

#endif

// The stack grows downwards

{{{ makeSetValue('max + 4', 0, '0x2135467', 'i32' ) }}}

{{{ makeSetValue('max + 8', 0, '0x89BACDFE', 'i32' ) }}}

#if !USE_ASAN && !SAFE_HEAP // ASan and SAFE_HEAP check address 0 themselves

// Also test the global address 0 for integrity.

HEAP32[0] = 0x63736d65; /* 'emsc' */

#endif

}

function checkStackCookie() {

#if !MINIMAL_RUNTIME

if (ABORT) return;

#endif

var max = _emscripten_stack_get_end();

var cookie1 = {{{ makeGetValue('max + 4', '0', 'i32', 0, true) }}};

var cookie2 = {{{ makeGetValue('max + 8', '0', 'i32', 0, true) }}};

if (cookie1 != 0x2135467 || cookie2 != 0x89BACDFE) {

abort('Stack overflow! Stack cookie has been overwritten, expected hex dwords 0x89BACDFE and 0x2135467, but received 0x' + cookie2.toString(16) + ' 0x' + cookie1.toString(16));

}

#if !USE_ASAN && !SAFE_HEAP // ASan and SAFE_HEAP check address 0 themselves

// Also test the global address 0 for integrity.

if (HEAP32[0] !== 0x63736d65 /* 'emsc' */) abort('Runtime error: The application has corrupted its heap memory area (address zero)!');

#endif

}

#endif