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test_add_function.cpp
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65 lines (56 loc) · 1.72 KB
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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 <stdlib.h>
#include <emscripten.h>
int foo() {
return 1;
}
int bar() {
return 2;
}
EMSCRIPTEN_KEEPALIVE
extern "C" int baz() {
return 3;
}
EM_JS_DEPS(main, "$addFunction,$removeFunction");
int main(int argc, char **argv) {
#if defined(GROWTH)
EM_ASM({
// Get an export that isn't in the table (we never took its address in C).
var baz = wasmExports["baz"];
var tableSizeBefore = wasmTable.length;
var bazIndex = addFunction(baz);
assert(bazIndex >= tableSizeBefore, "we actually added it");
assert(addFunction(baz) === bazIndex, "we never add it again");
});
#endif
int fp = atoi(argv[1]);
printf("fp: %d\n", fp);
void (*f)(int) = reinterpret_cast<void (*)(int)>(fp);
f(7);
EM_ASM({
removeFunction($0)
}, f);
// We can reuse indexes
EM_ASM({
var beforeLength = wasmTable.length;
for (var i = 0; i < 10; i++) {
var index = addFunction(function(){}, 'v');
removeFunction(index);
}
assert(wasmTable.length === beforeLength);
});
// We guarantee index uniqueness for each function.
EM_ASM({
assert(wasmTable.length >= 3);
assert(addFunction(wasmTable.get(1)) === 1);
assert(addFunction(wasmTable.get(2)) === 2);
}, &foo, &bar); // taking the addresses here ensures they are in the table
// (the optimizer can't remove these uses) which then lets
// us assume the table is of a certain size in the test.
printf("ok\n");
return 0;
}