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// Copyright 2016 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.
#include <stdio.h>
#include <string.h>
#include <emscripten.h>
void __attribute__((noinline)) InteropString(char *staticBuffer)
char *string = (char*)EM_ASM_INT({
var str = "hello, this is a string! ";
for(var i = 0; i < 15; ++i)
str = str + str;
var stringOnTheStack = allocate(intArrayFromString(str), 'i8', ALLOC_STACK);
return stringOnTheStack;
int stringLength = strlen(string);
printf("Got string: %s\n", string);
printf("Received a string of length %d.\n", stringLength);
strcpy(staticBuffer, string);
int main()
char staticBuffer[512288] = {}; // Make asm.js side consume a large portion of the stack, before bumping the rest with C++<->JS interop.
int stringLength = strlen(staticBuffer);
printf("Got string: %s\n", staticBuffer);
printf("Received a string of length %d.\n", stringLength);