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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --expose-wasm --expose-gc
load("test/mjsunit/wasm/wasm-module-builder.js");
// This test verifies that when instances are exported, Gc'ed, the other
// instances in the chain still maintain a consistent view of the memory.
(function ValidateSharedInstanceMemory() {
print("ValidateSharedInstanceMemory");
let memory = new WebAssembly.Memory({initial: 5, maximum: 100});
var builder = new WasmModuleBuilder();
builder.addImportedMemory("mod", "imported_mem");
builder.addFunction("mem_size", kSig_i_v)
.addBody([kExprMemorySize, kMemoryZero])
.exportFunc();
builder.addFunction("grow", kSig_i_i)
.addBody([kExprLocalGet, 0, kExprMemoryGrow, kMemoryZero])
.exportFunc();
var instances = [];
for (var i = 0; i < 5; i++) {
instances.push(builder.instantiate({mod: {imported_mem: memory}}));
}
function grow_instance(index, pages) {
return instances[index].exports.grow(pages);
}
function verify_mem_size(expected_pages) {
print(" checking size = " + expected_pages + " pages");
assertEquals(expected_pages*kPageSize, memory.buffer.byteLength);
for (let i = 0; i < instances.length; i++) {
if (instances[i] == null) continue;
assertEquals(expected_pages, instances[i].exports.mem_size());
}
}
// Verify initial memory size of all instances, grow and verify that all
// instances are updated correctly.
verify_mem_size(5);
assertEquals(5, memory.grow(6));
verify_mem_size(11);
print(" instances[1] = null, GC");
instances[1] = null;
gc();
// i[0] - i[2] - i[3] - i[4]
verify_mem_size(11);
assertEquals(11, grow_instance(2, 10));
verify_mem_size(21);
print(" instances[4] = null, GC");
instances[4] = null;
gc();
verify_mem_size(21);
assertEquals(21, memory.grow(2));
verify_mem_size(23);
print(" instances[0] = null, GC");
instances[0] = null;
gc();
gc();
verify_mem_size(23);
assertEquals(23, grow_instance(3, 5));
verify_mem_size(28);
print(" new instance, GC");
// Instantiate a new instance and verify that it can be grown correctly.
instances.push(builder.instantiate({mod: {imported_mem: memory}}));
gc();
gc();
verify_mem_size(28);
assertEquals(28, grow_instance(5, 2));
verify_mem_size(30);
assertEquals(30, memory.grow(5));
verify_mem_size(35);
for (let i = 0; i < instances.length; i++) {
print(" instances[" + i + "] = null, GC");
instances[i] = null;
gc();
verify_mem_size(35);
}
})();
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