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emscripten_lazy_load_code.cpp

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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.

*/

#include <emscripten.h>

#include <stdio.h>

#include <stdlib.h>

extern "C" {

EM_JS(void, log_started, (), {

out("foo_start");

})

EM_JS(void, log_ended, (), {

out("foo_end");

})

void foo_start(int n) {

log_started();

// prevent inlining

if (n > 10000) foo_start(n - 1);

if (n > 15000) foo_start(n - 3);

}

void foo_end(int n) {

log_ended();

// prevent inlining

if (n > 20000) foo_end(n - 2);

if (n > 30000) foo_end(n - 5);

}

} // extern "C"

int main(int argc, char** argv) {

int x = atoi(argv[1]);

foo_start(x);

#ifdef CONDITIONAL

if (x != 42) {

#endif

emscripten_lazy_load_code();

#ifdef CONDITIONAL

}

#endif

foo_end(x); // this can be elided in the first download, only needed after we lazily load the second

printf("all done, %d", x); // only when we reach here do we need stdio linked in

}