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// Copyright 2018 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: --allow-natives-syntax --wasm-trap-handler-fallback
load("test/mjsunit/wasm/wasm-constants.js");
load("test/mjsunit/wasm/wasm-module-builder.js");
// Make sure we can get at least one guard region if the trap handler is enabled.
(function CanGetGuardRegionTest() {
print("CanGetGuardRegionTest()");
const memory = new WebAssembly.Memory({initial: 1});
if (%IsWasmTrapHandlerEnabled()) {
assertTrue(%WasmMemoryHasFullGuardRegion(memory));
}
})();
// This test verifies that when we have too many outstanding memories to get
// another fast memory, we fall back on bounds checking rather than failing.
(function TrapHandlerFallbackTest() {
print("TrapHandlerFallbackTest()");
let builder = new WasmModuleBuilder();
builder.addImportedMemory("mod", "imported_mem", 1);
builder.addFunction("load", kSig_i_i)
.addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
.exportFunc();
let memory;
let instance;
let instances = [];
let fallback_occurred = false;
// Create 135 instances. V8 limits wasm to slightly more than 1 TiB of address
// space per isolate (see kAddressSpaceLimit in wasm-memory.cc), which allows
// up to 128 fast memories. As long as we create more than that, we should
// trigger the fallback behavior.
for (var i = 0; i < 135 && !fallback_occurred; i++) {
memory = new WebAssembly.Memory({initial: 1});
instance = builder.instantiate({mod: {imported_mem: memory}});
instances.push(instance);
assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(1 << 20));
fallback_occurred = !%WasmMemoryHasFullGuardRegion(memory);
}
assertTrue(fallback_occurred);
})();
(function TrapHandlerFallbackTestZeroInitialMemory() {
print("TrapHandlerFallbackTestZeroInitialMemory()");
let builder = new WasmModuleBuilder();
builder.addImportedMemory("mod", "imported_mem", 0);
builder.addFunction("load", kSig_i_i)
.addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
.exportFunc();
let memory;
let instance;
let instances = [];
let fallback_occurred = false;
// Create 135 instances. V8 limits wasm to slightly more than 1 TiB of address
// space per isolate (see kAddressSpaceLimit in wasm-memory.cc), which allows
// up to 128 fast memories. As long as we create more than that, we should
// trigger the fallback behavior.
for (var i = 0; i < 135 && !fallback_occurred; i++) {
memory = new WebAssembly.Memory({initial: 1});
instance = builder.instantiate({mod: {imported_mem: memory}});
instances.push(instance);
assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(1 << 20));
fallback_occurred = !%WasmMemoryHasFullGuardRegion(memory);
}
assertTrue(fallback_occurred);
})();
(function TrapHandlerFallbackTestGrowFromZero() {
print("TrapHandlerFallbackTestGrowFromZero()");
// Create a zero-length memory to make sure the empty backing store is created.
const zero_memory = new WebAssembly.Memory({initial: 0});
// Create enough memories to overflow the address space limit
let memories = []
for (var i = 0; i < 135; i++) {
memories.push(new WebAssembly.Memory({initial: 1}));
}
// Create a memory for the module. We'll grow this later.
let memory = new WebAssembly.Memory({initial: 0});
let builder = new WasmModuleBuilder();
builder.addImportedMemory("mod", "imported_mem", 0);
builder.addFunction("load", kSig_i_i)
.addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
.exportFunc();
instance = builder.instantiate({mod: {imported_mem: memory}});
assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(1 << 20));
try {
memory.grow(1);
} catch(e) {
if (typeof e == typeof new RangeError) {
return;
}
throw e;
}
assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(1 << 20));
})();
// Like TrapHandlerFallbackTest, but allows the module to be reused, so we only
// have to recompile once.
(function TrapHandlerFallbackTestReuseModule() {
print("TrapHandlerFallbackTestReuseModule()");
let builder = new WasmModuleBuilder();
builder.addImportedMemory("mod", "imported_mem", 1);
builder.addFunction("load", kSig_i_i)
.addBody([kExprGetLocal, 0, kExprI32LoadMem, 0, 0])
.exportFunc();
let memory;
let instance;
let instances = [];
let fallback_occurred = false;
// Create 135 instances. V8 limits wasm to slightly more than 1 TiB of address
// space per isolate (see kAddressSpaceLimit in wasm-memory.cc), which allows
// up to 128 fast memories. As long as we create more than that, we should
// trigger the fallback behavior.
const module = builder.toModule();
for (var i = 0; i < 135 && !fallback_occurred; i++) {
memory = new WebAssembly.Memory({initial: 1});
instance = new WebAssembly.Instance(module, {mod: {imported_mem: memory}});
instances.push(instance);
assertTraps(kTrapMemOutOfBounds, () => instance.exports.load(1 << 20));
fallback_occurred = !%WasmMemoryHasFullGuardRegion(memory);
}
assertTrue(fallback_occurred);
})();
// Make sure that a bounds checked instance still works when calling an
// imported unchecked function.
(function CallIndirectImportTest() {
print("CallIndirectImportTest()");
// Create an unchecked instance that calls a function through an indirect
// table.
const instance_a = (() => {
const builder = new WasmModuleBuilder();
builder.addMemory(1, 1, false);
builder.addFunction("read_mem", kSig_i_i)
.addBody([
kExprGetLocal, 0,
kExprI32LoadMem, 0, 0
]).exportAs("read_mem");
return builder.instantiate();
})();
// Create new memories until we get one that is unguarded
let memories = [];
let memory;
for (var i = 0; i < 135; i++) {
memory = new WebAssembly.Memory({initial: 1});
memories.push(memory);
if (!%WasmMemoryHasFullGuardRegion(memory)) {
break;
}
}
assertFalse(%WasmMemoryHasFullGuardRegion(memory));
// create a module that imports a function through a table
const instance_b = (() => {
const builder = new WasmModuleBuilder();
builder.addFunction("main", kSig_i_i)
.addBody([
kExprGetLocal, 0,
kExprI32Const, 0,
kExprCallIndirect, 0, kTableZero
]).exportAs("main");
builder.addImportedTable("env", "table", 1, 1);
const module = new WebAssembly.Module(builder.toBuffer());
const table = new WebAssembly.Table({
element: "anyfunc",
initial: 1, maximum: 1
});
// Hook the new instance's export into the old instance's table.
table.set(0, instance_a.exports.read_mem);
return new WebAssembly.Instance(module, {'env': { 'table': table }});
})();
// Make sure we get an out of bounds still.
assertTraps(kTrapMemOutOfBounds, () => instance_b.exports.main(100000));
})();
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