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chromium / v8 / v8 / 5f960dfc06a7c95af69e2b09f772b2280168469b / . / src / wasm / wasm-objects.cc
blob: b254c8a5edee028dda3bb86b4a26b3e2ce787244 [file] [log] [blame]
// Copyright 2015 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.
#include "src/wasm/wasm-objects.h"
#include "src/utils.h"
#include "src/assembler-inl.h"
#include "src/base/iterator.h"
#include "src/compiler/wasm-compiler.h"
#include "src/debug/debug-interface.h"
#include "src/objects-inl.h"
#include "src/objects/debug-objects-inl.h"
#include "src/wasm/module-compiler.h"
#include "src/wasm/module-decoder.h"
#include "src/wasm/wasm-code-specialization.h"
#include "src/wasm/wasm-memory.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-text.h"
#define TRACE(...) \
do { \
if (FLAG_trace_wasm_instances) PrintF(__VA_ARGS__); \
} while (false)
namespace v8 {
namespace internal {
// Import a few often used types from the wasm namespace.
using GlobalHandleAddress = wasm::GlobalHandleAddress;
using WasmFunction = wasm::WasmFunction;
using WasmModule = wasm::WasmModule;
namespace {
// An iterator that returns first the module itself, then all modules linked via
// next, then all linked via prev.
class CompiledModulesIterator
: public v8::base::iterator<std::input_iterator_tag,
Handle<WasmCompiledModule>> {
public:
CompiledModulesIterator(Isolate* isolate,
Handle<WasmCompiledModule> start_module, bool at_end)
: isolate_(isolate),
start_module_(start_module),
current_(at_end ? Handle<WasmCompiledModule>::null() : start_module) {}
Handle<WasmCompiledModule> operator*() const {
DCHECK(!current_.is_null());
return current_;
}
void operator++() { Advance(); }
bool operator!=(const CompiledModulesIterator& other) {
DCHECK(start_module_.is_identical_to(other.start_module_));
return !current_.is_identical_to(other.current_);
}
private:
void Advance() {
DCHECK(!current_.is_null());
if (!is_backwards_) {
if (current_->has_weak_next_instance()) {
WeakCell* weak_next = current_->ptr_to_weak_next_instance();
if (!weak_next->cleared()) {
current_ =
handle(WasmCompiledModule::cast(weak_next->value()), isolate_);
return;
}
}
// No more modules in next-links, now try the previous-links.
is_backwards_ = true;
current_ = start_module_;
}
if (current_->has_weak_prev_instance()) {
WeakCell* weak_prev = current_->ptr_to_weak_prev_instance();
if (!weak_prev->cleared()) {
current_ =
handle(WasmCompiledModule::cast(weak_prev->value()), isolate_);
return;
}
}
current_ = Handle<WasmCompiledModule>::null();
}
friend class CompiledModuleInstancesIterator;
Isolate* isolate_;
Handle<WasmCompiledModule> start_module_;
Handle<WasmCompiledModule> current_;
bool is_backwards_ = false;
};
// An iterator based on the CompiledModulesIterator, but it returns all live
// instances, not the WasmCompiledModules itself.
class CompiledModuleInstancesIterator
: public v8::base::iterator<std::input_iterator_tag,
Handle<WasmInstanceObject>> {
public:
CompiledModuleInstancesIterator(Isolate* isolate,
Handle<WasmCompiledModule> start_module,
bool at_end)
: it(isolate, start_module, at_end) {
while (NeedToAdvance()) ++it;
}
Handle<WasmInstanceObject> operator*() {
return handle(
WasmInstanceObject::cast((*it)->weak_owning_instance()->value()),
it.isolate_);
}
void operator++() {
do {
++it;
} while (NeedToAdvance());
}
bool operator!=(const CompiledModuleInstancesIterator& other) {
return it != other.it;
}
private:
bool NeedToAdvance() {
return !it.current_.is_null() &&
(!it.current_->has_weak_owning_instance() ||
it.current_->ptr_to_weak_owning_instance()->cleared());
}
CompiledModulesIterator it;
};
v8::base::iterator_range<CompiledModuleInstancesIterator>
iterate_compiled_module_instance_chain(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
return {CompiledModuleInstancesIterator(isolate, compiled_module, false),
CompiledModuleInstancesIterator(isolate, compiled_module, true)};
}
#ifdef DEBUG
bool IsBreakablePosition(Handle<WasmCompiledModule> compiled_module,
int func_index, int offset_in_func) {
DisallowHeapAllocation no_gc;
AccountingAllocator alloc;
Zone tmp(&alloc, ZONE_NAME);
wasm::BodyLocalDecls locals(&tmp);
const byte* module_start = compiled_module->module_bytes()->GetChars();
WasmFunction& func = compiled_module->module()->functions[func_index];
wasm::BytecodeIterator iterator(module_start + func.code.offset(),
module_start + func.code.end_offset(),
&locals);
DCHECK_LT(0, locals.encoded_size);
for (uint32_t offset : iterator.offsets()) {
if (offset > static_cast<uint32_t>(offset_in_func)) break;
if (offset == static_cast<uint32_t>(offset_in_func)) return true;
}
return false;
}
#endif // DEBUG
} // namespace
Handle<WasmModuleObject> WasmModuleObject::New(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
Handle<JSFunction> module_cons(
isolate->native_context()->wasm_module_constructor());
auto module_object = Handle<WasmModuleObject>::cast(
isolate->factory()->NewJSObject(module_cons));
module_object->set_compiled_module(*compiled_module);
Handle<WeakCell> link_to_module =
isolate->factory()->NewWeakCell(module_object);
compiled_module->set_weak_wasm_module(link_to_module);
return module_object;
}
void WasmModuleObject::ValidateStateForTesting(
Isolate* isolate, Handle<WasmModuleObject> module_obj) {
DisallowHeapAllocation no_gc;
WasmCompiledModule* compiled_module = module_obj->compiled_module();
CHECK(compiled_module->has_weak_wasm_module());
CHECK_EQ(compiled_module->ptr_to_weak_wasm_module()->value(), *module_obj);
CHECK(!compiled_module->has_weak_prev_instance());
CHECK(!compiled_module->has_weak_next_instance());
CHECK(!compiled_module->has_weak_owning_instance());
}
Handle<WasmTableObject> WasmTableObject::New(Isolate* isolate, uint32_t initial,
int64_t maximum,
Handle<FixedArray>* js_functions) {
Handle<JSFunction> table_ctor(
isolate->native_context()->wasm_table_constructor());
auto table_obj = Handle<WasmTableObject>::cast(
isolate->factory()->NewJSObject(table_ctor));
*js_functions = isolate->factory()->NewFixedArray(initial);
Object* null = isolate->heap()->null_value();
for (int i = 0; i < static_cast<int>(initial); ++i) {
(*js_functions)->set(i, null);
}
table_obj->set_functions(**js_functions);
DCHECK_EQ(maximum, static_cast<int>(maximum));
Handle<Object> max = isolate->factory()->NewNumber(maximum);
table_obj->set_maximum_length(*max);
Handle<FixedArray> dispatch_tables = isolate->factory()->NewFixedArray(0);
table_obj->set_dispatch_tables(*dispatch_tables);
return Handle<WasmTableObject>::cast(table_obj);
}
Handle<FixedArray> WasmTableObject::AddDispatchTable(
Isolate* isolate, Handle<WasmTableObject> table_obj,
Handle<WasmInstanceObject> instance, int table_index,
Handle<FixedArray> function_table, Handle<FixedArray> signature_table) {
Handle<FixedArray> dispatch_tables(table_obj->dispatch_tables());
DCHECK_EQ(0, dispatch_tables->length() % 4);
if (instance.is_null()) return dispatch_tables;
// TODO(titzer): use weak cells here to avoid leaking instances.
// Grow the dispatch table and add a new entry at the end.
Handle<FixedArray> new_dispatch_tables =
isolate->factory()->CopyFixedArrayAndGrow(dispatch_tables, 4);
new_dispatch_tables->set(dispatch_tables->length() + 0, *instance);
new_dispatch_tables->set(dispatch_tables->length() + 1,
Smi::FromInt(table_index));
new_dispatch_tables->set(dispatch_tables->length() + 2, *function_table);
new_dispatch_tables->set(dispatch_tables->length() + 3, *signature_table);
table_obj->set_dispatch_tables(*new_dispatch_tables);
return new_dispatch_tables;
}
void WasmTableObject::Grow(Isolate* isolate, uint32_t count) {
Handle<FixedArray> dispatch_tables(this->dispatch_tables());
DCHECK_EQ(0, dispatch_tables->length() % 4);
uint32_t old_size = functions()->length();
Zone specialization_zone(isolate->allocator(), ZONE_NAME);
for (int i = 0; i < dispatch_tables->length(); i += 4) {
Handle<FixedArray> old_function_table(
FixedArray::cast(dispatch_tables->get(i + 2)));
Handle<FixedArray> old_signature_table(
FixedArray::cast(dispatch_tables->get(i + 3)));
Handle<FixedArray> new_function_table = isolate->global_handles()->Create(
*isolate->factory()->CopyFixedArrayAndGrow(old_function_table, count));
Handle<FixedArray> new_signature_table = isolate->global_handles()->Create(
*isolate->factory()->CopyFixedArrayAndGrow(old_signature_table, count));
GlobalHandleAddress new_function_table_addr = new_function_table.address();
GlobalHandleAddress new_signature_table_addr =
new_signature_table.address();
int table_index = Smi::cast(dispatch_tables->get(i + 1))->value();
// Update dispatch tables with new function/signature tables
dispatch_tables->set(i + 2, *new_function_table);
dispatch_tables->set(i + 3, *new_signature_table);
// Patch the code of the respective instance.
{
DisallowHeapAllocation no_gc;
wasm::CodeSpecialization code_specialization(isolate,
&specialization_zone);
WasmInstanceObject* instance =
WasmInstanceObject::cast(dispatch_tables->get(i));
WasmCompiledModule* compiled_module = instance->compiled_module();
GlobalHandleAddress old_function_table_addr =
WasmCompiledModule::GetTableValue(
compiled_module->ptr_to_function_tables(), table_index);
GlobalHandleAddress old_signature_table_addr =
WasmCompiledModule::GetTableValue(
compiled_module->ptr_to_signature_tables(), table_index);
code_specialization.PatchTableSize(old_size, old_size + count);
code_specialization.RelocatePointer(old_function_table_addr,
new_function_table_addr);
code_specialization.RelocatePointer(old_signature_table_addr,
new_signature_table_addr);
code_specialization.ApplyToWholeInstance(instance);
WasmCompiledModule::UpdateTableValue(
compiled_module->ptr_to_function_tables(), table_index,
new_function_table_addr);
WasmCompiledModule::UpdateTableValue(
compiled_module->ptr_to_signature_tables(), table_index,
new_signature_table_addr);
}
}
}
void WasmTableObject::Set(Isolate* isolate, Handle<WasmTableObject> table,
int32_t index, Handle<JSFunction> function) {
Handle<FixedArray> array(table->functions(), isolate);
Handle<FixedArray> dispatch_tables(table->dispatch_tables(), isolate);
WasmFunction* wasm_function = nullptr;
Handle<Code> code = Handle<Code>::null();
Handle<Object> value = isolate->factory()->null_value();
if (!function.is_null()) {
auto exported_function = Handle<WasmExportedFunction>::cast(function);
wasm_function = wasm::GetWasmFunctionForExport(isolate, function);
// The verification that {function} is an export was done
// by the caller.
DCHECK_NOT_NULL(wasm_function);
value = function;
// TODO(titzer): Make JSToWasm wrappers just call the WASM to WASM wrapper,
// and then we can just reuse the WASM to WASM wrapper.
Address new_context_address = reinterpret_cast<Address>(
exported_function->instance()->wasm_context()->get());
code = compiler::CompileWasmToWasmWrapper(
isolate, exported_function->GetWasmCode(), wasm_function->sig,
exported_function->function_index(), new_context_address);
}
UpdateDispatchTables(isolate, dispatch_tables, index, wasm_function, code);
array->set(index, *value);
}
namespace {
Handle<JSArrayBuffer> GrowMemoryBuffer(Isolate* isolate,
Handle<JSArrayBuffer> old_buffer,
uint32_t pages, uint32_t maximum_pages) {
if (!old_buffer->is_growable()) return Handle<JSArrayBuffer>::null();
Address old_mem_start = nullptr;
uint32_t old_size = 0;
if (!old_buffer.is_null()) {
old_mem_start = static_cast<Address>(old_buffer->backing_store());
CHECK(old_buffer->byte_length()->ToUint32(&old_size));
}
DCHECK_EQ(0, old_size % WasmModule::kPageSize);
uint32_t old_pages = old_size / WasmModule::kPageSize;
DCHECK_GE(std::numeric_limits<uint32_t>::max(),
old_size + pages * WasmModule::kPageSize);
if (old_pages > maximum_pages || pages > maximum_pages - old_pages) {
return Handle<JSArrayBuffer>::null();
}
const bool enable_guard_regions = old_buffer.is_null()
? trap_handler::UseTrapHandler()
: old_buffer->has_guard_region();
size_t new_size =
static_cast<size_t>(old_pages + pages) * WasmModule::kPageSize;
if (enable_guard_regions && old_size != 0) {
DCHECK_NOT_NULL(old_buffer->backing_store());
if (new_size > FLAG_wasm_max_mem_pages * WasmModule::kPageSize ||
new_size > kMaxInt) {
return Handle<JSArrayBuffer>::null();
}
isolate->array_buffer_allocator()->SetProtection(
old_mem_start, new_size,
v8::ArrayBuffer::Allocator::Protection::kReadWrite);
reinterpret_cast<v8::Isolate*>(isolate)
->AdjustAmountOfExternalAllocatedMemory(pages * WasmModule::kPageSize);
Handle<Object> length_obj = isolate->factory()->NewNumberFromSize(new_size);
old_buffer->set_byte_length(*length_obj);
return old_buffer;
} else {
Handle<JSArrayBuffer> new_buffer;
new_buffer = wasm::NewArrayBuffer(isolate, new_size, enable_guard_regions);
if (new_buffer.is_null() || old_size == 0) return new_buffer;
Address new_mem_start = static_cast<Address>(new_buffer->backing_store());
memcpy(new_mem_start, old_mem_start, old_size);
return new_buffer;
}
}
// May GC, because SetSpecializationMemInfoFrom may GC
void SetInstanceMemory(Isolate* isolate, Handle<WasmInstanceObject> instance,
Handle<JSArrayBuffer> buffer) {
instance->set_memory_buffer(*buffer);
auto wasm_context = instance->wasm_context()->get();
wasm_context->mem_start = reinterpret_cast<byte*>(buffer->backing_store());
wasm_context->mem_size = buffer->byte_length()->Number();
#if DEBUG
// To flush out bugs earlier, in DEBUG mode, check that all pages of the
// memory are accessible by reading and writing one byte on each page.
for (uint32_t offset = 0; offset < wasm_context->mem_size;
offset += WasmModule::kPageSize) {
byte val = wasm_context->mem_start[offset];
wasm_context->mem_start[offset] = val;
}
#endif
}
} // namespace
Handle<WasmMemoryObject> WasmMemoryObject::New(Isolate* isolate,
Handle<JSArrayBuffer> buffer,
int32_t maximum) {
Handle<JSFunction> memory_ctor(
isolate->native_context()->wasm_memory_constructor());
auto memory_obj = Handle<WasmMemoryObject>::cast(
isolate->factory()->NewJSObject(memory_ctor, TENURED));
if (buffer.is_null()) {
// If no buffer was provided, create a 0-length one.
buffer = wasm::SetupArrayBuffer(isolate, nullptr, 0, nullptr, 0, false,
trap_handler::UseTrapHandler());
} else {
// Paranoid check that the buffer size makes sense.
uint32_t mem_size = 0;
CHECK(buffer->byte_length()->ToUint32(&mem_size));
}
memory_obj->set_array_buffer(*buffer);
memory_obj->set_maximum_pages(maximum);
return memory_obj;
}
uint32_t WasmMemoryObject::current_pages() {
uint32_t byte_length;
CHECK(array_buffer()->byte_length()->ToUint32(&byte_length));
return byte_length / WasmModule::kPageSize;
}
void WasmMemoryObject::AddInstance(Isolate* isolate,
Handle<WasmMemoryObject> memory,
Handle<WasmInstanceObject> instance) {
Handle<WeakFixedArray> old_instances =
memory->has_instances()
? Handle<WeakFixedArray>(memory->instances(), isolate)
: Handle<WeakFixedArray>::null();
Handle<WeakFixedArray> new_instances =
WeakFixedArray::Add(old_instances, instance);
memory->set_instances(*new_instances);
Handle<JSArrayBuffer> buffer(memory->array_buffer(), isolate);
SetInstanceMemory(isolate, instance, buffer);
}
void WasmMemoryObject::RemoveInstance(Isolate* isolate,
Handle<WasmMemoryObject> memory,
Handle<WasmInstanceObject> instance) {
if (memory->has_instances()) {
memory->instances()->Remove(instance);
}
}
void WasmMemoryObject::SetupNewBufferWithSameBackingStore(
Isolate* isolate, Handle<WasmMemoryObject> memory_object, uint32_t size) {
// In case of Memory.Grow(0), or Memory.Grow(delta) with guard pages enabled,
// Setup a new buffer, update memory object, and instances associated with the
// memory object, as the current buffer will be detached.
Handle<JSArrayBuffer> old_buffer(memory_object->array_buffer());
Handle<JSArrayBuffer> new_buffer;
constexpr bool is_external = false;
new_buffer = wasm::SetupArrayBuffer(
isolate, old_buffer->allocation_base(), old_buffer->allocation_length(),
old_buffer->backing_store(), size * WasmModule::kPageSize, is_external,
old_buffer->has_guard_region());
if (memory_object->has_instances()) {
Handle<WeakFixedArray> instances(memory_object->instances(), isolate);
for (int i = 0; i < instances->Length(); i++) {
Object* elem = instances->Get(i);
if (!elem->IsWasmInstanceObject()) continue;
Handle<WasmInstanceObject> instance(WasmInstanceObject::cast(elem),
isolate);
SetInstanceMemory(isolate, instance, new_buffer);
}
}
memory_object->set_array_buffer(*new_buffer);
}
// static
int32_t WasmMemoryObject::Grow(Isolate* isolate,
Handle<WasmMemoryObject> memory_object,
uint32_t pages) {
Handle<JSArrayBuffer> old_buffer(memory_object->array_buffer());
if (!old_buffer->is_growable()) return -1;
uint32_t old_size = 0;
CHECK(old_buffer->byte_length()->ToUint32(&old_size));
DCHECK_EQ(0, old_size % WasmModule::kPageSize);
Handle<JSArrayBuffer> new_buffer;
// Return current size if grow by 0.
if (pages == 0) return old_size / WasmModule::kPageSize;
uint32_t maximum_pages = FLAG_wasm_max_mem_pages;
if (memory_object->has_maximum_pages()) {
maximum_pages = Min(FLAG_wasm_max_mem_pages,
static_cast<uint32_t>(memory_object->maximum_pages()));
}
new_buffer = GrowMemoryBuffer(isolate, old_buffer, pages, maximum_pages);
if (new_buffer.is_null()) return -1;
if (memory_object->has_instances()) {
Handle<WeakFixedArray> instances(memory_object->instances(), isolate);
for (int i = 0; i < instances->Length(); i++) {
Object* elem = instances->Get(i);
if (!elem->IsWasmInstanceObject()) continue;
Handle<WasmInstanceObject> instance(WasmInstanceObject::cast(elem),
isolate);
SetInstanceMemory(isolate, instance, new_buffer);
}
}
memory_object->set_array_buffer(*new_buffer);
return old_size / WasmModule::kPageSize;
}
WasmModuleObject* WasmInstanceObject::module_object() {
return *compiled_module()->wasm_module();
}
WasmModule* WasmInstanceObject::module() { return compiled_module()->module(); }
Handle<WasmDebugInfo> WasmInstanceObject::GetOrCreateDebugInfo(
Handle<WasmInstanceObject> instance) {
if (instance->has_debug_info()) return handle(instance->debug_info());
Handle<WasmDebugInfo> new_info = WasmDebugInfo::New(instance);
DCHECK(instance->has_debug_info());
return new_info;
}
Handle<WasmInstanceObject> WasmInstanceObject::New(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
Handle<JSFunction> instance_cons(
isolate->native_context()->wasm_instance_constructor());
Handle<JSObject> instance_object =
isolate->factory()->NewJSObject(instance_cons, TENURED);
Handle<WasmInstanceObject> instance(
reinterpret_cast<WasmInstanceObject*>(*instance_object), isolate);
auto wasm_context = Managed<WasmContext>::Allocate(isolate);
wasm_context->get()->mem_start = nullptr;
wasm_context->get()->mem_size = 0;
wasm_context->get()->globals_start = nullptr;
instance->set_wasm_context(*wasm_context);
instance->set_compiled_module(*compiled_module);
return instance;
}
int32_t WasmInstanceObject::GetMemorySize() {
if (!has_memory_buffer()) return 0;
uint32_t bytes = memory_buffer()->byte_length()->Number();
DCHECK_EQ(0, bytes % WasmModule::kPageSize);
return bytes / WasmModule::kPageSize;
}
int32_t WasmInstanceObject::GrowMemory(Isolate* isolate,
Handle<WasmInstanceObject> instance,
uint32_t pages) {
if (pages == 0) return instance->GetMemorySize();
DCHECK(instance->has_memory_object());
return WasmMemoryObject::Grow(
isolate, handle(instance->memory_object(), isolate), pages);
}
uint32_t WasmInstanceObject::GetMaxMemoryPages() {
if (has_memory_object()) {
if (memory_object()->has_maximum_pages()) {
uint32_t maximum =
static_cast<uint32_t>(memory_object()->maximum_pages());
if (maximum < FLAG_wasm_max_mem_pages) return maximum;
}
}
uint32_t compiled_maximum_pages = compiled_module()->module()->maximum_pages;
Isolate* isolate = GetIsolate();
assert(compiled_module()->module()->is_wasm());
isolate->counters()->wasm_wasm_max_mem_pages_count()->AddSample(
compiled_maximum_pages);
if (compiled_maximum_pages != 0) return compiled_maximum_pages;
return FLAG_wasm_max_mem_pages;
}
WasmInstanceObject* WasmInstanceObject::GetOwningInstance(Code* code) {
DisallowHeapAllocation no_gc;
DCHECK(code->kind() == Code::WASM_FUNCTION ||
code->kind() == Code::WASM_INTERPRETER_ENTRY);
FixedArray* deopt_data = code->deoptimization_data();
DCHECK_EQ(code->kind() == Code::WASM_INTERPRETER_ENTRY ? 1 : 2,
deopt_data->length());
Object* weak_link = deopt_data->get(0);
DCHECK(weak_link->IsWeakCell());
WeakCell* cell = WeakCell::cast(weak_link);
if (cell->cleared()) return nullptr;
return WasmInstanceObject::cast(cell->value());
}
void WasmInstanceObject::ValidateInstancesChainForTesting(
Isolate* isolate, Handle<WasmModuleObject> module_obj, int instance_count) {
CHECK_GE(instance_count, 0);
DisallowHeapAllocation no_gc;
WasmCompiledModule* compiled_module = module_obj->compiled_module();
CHECK_EQ(JSObject::cast(compiled_module->ptr_to_weak_wasm_module()->value()),
*module_obj);
Object* prev = nullptr;
int found_instances = compiled_module->has_weak_owning_instance() ? 1 : 0;
WasmCompiledModule* current_instance = compiled_module;
while (current_instance->has_weak_next_instance()) {
CHECK((prev == nullptr && !current_instance->has_weak_prev_instance()) ||
current_instance->ptr_to_weak_prev_instance()->value() == prev);
CHECK_EQ(current_instance->ptr_to_weak_wasm_module()->value(), *module_obj);
CHECK(current_instance->ptr_to_weak_owning_instance()
->value()
->IsWasmInstanceObject());
prev = current_instance;
current_instance = WasmCompiledModule::cast(
current_instance->ptr_to_weak_next_instance()->value());
++found_instances;
CHECK_LE(found_instances, instance_count);
}
CHECK_EQ(found_instances, instance_count);
}
void WasmInstanceObject::ValidateOrphanedInstanceForTesting(
Isolate* isolate, Handle<WasmInstanceObject> instance) {
DisallowHeapAllocation no_gc;
WasmCompiledModule* compiled_module = instance->compiled_module();
CHECK(compiled_module->has_weak_wasm_module());
CHECK(compiled_module->ptr_to_weak_wasm_module()->cleared());
}
bool WasmExportedFunction::IsWasmExportedFunction(Object* object) {
if (!object->IsJSFunction()) return false;
Handle<JSFunction> js_function(JSFunction::cast(object));
if (Code::JS_TO_WASM_FUNCTION != js_function->code()->kind()) return false;
Handle<Symbol> symbol(
js_function->GetIsolate()->factory()->wasm_instance_symbol());
MaybeHandle<Object> maybe_result =
JSObject::GetPropertyOrElement(js_function, symbol);
Handle<Object> result;
if (!maybe_result.ToHandle(&result)) return false;
return result->IsWasmInstanceObject();
}
WasmExportedFunction* WasmExportedFunction::cast(Object* object) {
DCHECK(IsWasmExportedFunction(object));
return reinterpret_cast<WasmExportedFunction*>(object);
}
WasmInstanceObject* WasmExportedFunction::instance() {
DisallowHeapAllocation no_allocation;
Handle<Symbol> symbol(GetIsolate()->factory()->wasm_instance_symbol());
MaybeHandle<Object> result =
JSObject::GetPropertyOrElement(handle(this), symbol);
return WasmInstanceObject::cast(*(result.ToHandleChecked()));
}
int WasmExportedFunction::function_index() {
DisallowHeapAllocation no_allocation;
Handle<Symbol> symbol = GetIsolate()->factory()->wasm_function_index_symbol();
MaybeHandle<Object> result =
JSObject::GetPropertyOrElement(handle(this), symbol);
return result.ToHandleChecked()->Number();
}
Handle<WasmExportedFunction> WasmExportedFunction::New(
Isolate* isolate, Handle<WasmInstanceObject> instance,
MaybeHandle<String> maybe_name, int func_index, int arity,
Handle<Code> export_wrapper) {
DCHECK_EQ(Code::JS_TO_WASM_FUNCTION, export_wrapper->kind());
Handle<String> name;
if (!maybe_name.ToHandle(&name)) {
EmbeddedVector<char, 16> buffer;
int length = SNPrintF(buffer, "%d", func_index);
name = isolate->factory()
->NewStringFromOneByte(
Vector<uint8_t>::cast(buffer.SubVector(0, length)))
.ToHandleChecked();
}
Handle<SharedFunctionInfo> shared =
isolate->factory()->NewSharedFunctionInfo(name, export_wrapper, false);
shared->set_length(arity);
shared->set_internal_formal_parameter_count(arity);
Handle<JSFunction> js_function = isolate->factory()->NewFunction(
isolate->sloppy_function_map(), name, export_wrapper);
js_function->set_shared(*shared);
Handle<Symbol> instance_symbol(isolate->factory()->wasm_instance_symbol());
JSObject::AddProperty(js_function, instance_symbol, instance, DONT_ENUM);
Handle<Symbol> function_index_symbol(
isolate->factory()->wasm_function_index_symbol());
JSObject::AddProperty(js_function, function_index_symbol,
isolate->factory()->NewNumber(func_index), DONT_ENUM);
return Handle<WasmExportedFunction>::cast(js_function);
}
Handle<Code> WasmExportedFunction::GetWasmCode() {
DisallowHeapAllocation no_gc;
Handle<Code> export_wrapper_code = handle(this->code());
DCHECK_EQ(export_wrapper_code->kind(), Code::JS_TO_WASM_FUNCTION);
int mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET);
for (RelocIterator it(*export_wrapper_code, mask);; it.next()) {
DCHECK(!it.done());
Code* target = Code::GetCodeFromTargetAddress(it.rinfo()->target_address());
if (target->kind() != Code::WASM_FUNCTION &&
target->kind() != Code::WASM_TO_JS_FUNCTION &&
target->kind() != Code::WASM_INTERPRETER_ENTRY)
continue;
// There should only be this one call to wasm code.
#ifdef DEBUG
for (it.next(); !it.done(); it.next()) {
Code* code = Code::GetCodeFromTargetAddress(it.rinfo()->target_address());
DCHECK(code->kind() != Code::WASM_FUNCTION &&
code->kind() != Code::WASM_TO_JS_FUNCTION &&
code->kind() != Code::WASM_INTERPRETER_ENTRY);
}
#endif
return handle(target);
}
UNREACHABLE();
}
bool WasmSharedModuleData::IsWasmSharedModuleData(Object* object) {
if (!object->IsFixedArray()) return false;
FixedArray* arr = FixedArray::cast(object);
if (arr->length() != kFieldCount) return false;
Isolate* isolate = arr->GetIsolate();
if (!arr->get(kModuleWrapperIndex)->IsForeign()) return false;
if (!arr->get(kModuleBytesIndex)->IsUndefined(isolate) &&
!arr->get(kModuleBytesIndex)->IsSeqOneByteString())
return false;
if (!arr->get(kScriptIndex)->IsScript()) return false;
if (!arr->get(kAsmJsOffsetTableIndex)->IsUndefined(isolate) &&
!arr->get(kAsmJsOffsetTableIndex)->IsByteArray())
return false;
if (!arr->get(kBreakPointInfosIndex)->IsUndefined(isolate) &&
!arr->get(kBreakPointInfosIndex)->IsFixedArray())
return false;
return true;
}
WasmSharedModuleData* WasmSharedModuleData::cast(Object* object) {
DCHECK(IsWasmSharedModuleData(object));
return reinterpret_cast<WasmSharedModuleData*>(object);
}
WasmModule* WasmSharedModuleData::module() {
// We populate the kModuleWrapper field with a Foreign holding the
// address to the address of a WasmModule. This is because we can
// handle both cases when the WasmModule's lifetime is managed through
// a Managed<WasmModule> object, as well as cases when it's managed
// by the embedder. CcTests fall into the latter case.
return *(reinterpret_cast<WasmModule**>(
Foreign::cast(get(kModuleWrapperIndex))->foreign_address()));
}
Handle<WasmSharedModuleData> WasmSharedModuleData::New(
Isolate* isolate, Handle<Foreign> module_wrapper,
Handle<SeqOneByteString> module_bytes, Handle<Script> script,
Handle<ByteArray> asm_js_offset_table) {
Handle<FixedArray> arr =
isolate->factory()->NewFixedArray(kFieldCount, TENURED);
arr->set(kModuleWrapperIndex, *module_wrapper);
if (!module_bytes.is_null()) {
arr->set(kModuleBytesIndex, *module_bytes);
}
if (!script.is_null()) {
arr->set(kScriptIndex, *script);
}
if (!asm_js_offset_table.is_null()) {
arr->set(kAsmJsOffsetTableIndex, *asm_js_offset_table);
}
DCHECK(WasmSharedModuleData::IsWasmSharedModuleData(*arr));
return Handle<WasmSharedModuleData>::cast(arr);
}
bool WasmSharedModuleData::is_asm_js() {
bool asm_js = module()->is_asm_js();
DCHECK_EQ(asm_js, script()->IsUserJavaScript());
DCHECK_EQ(asm_js, has_asm_js_offset_table());
return asm_js;
}
void WasmSharedModuleData::ReinitializeAfterDeserialization(
Isolate* isolate, Handle<WasmSharedModuleData> shared) {
DCHECK(shared->get(kModuleWrapperIndex)->IsUndefined(isolate));
#ifdef DEBUG
// No BreakpointInfo objects should survive deserialization.
if (shared->has_breakpoint_infos()) {
for (int i = 0, e = shared->breakpoint_infos()->length(); i < e; ++i) {
DCHECK(shared->breakpoint_infos()->get(i)->IsUndefined(isolate));
}
}
#endif
shared->set(kBreakPointInfosIndex, isolate->heap()->undefined_value());
WasmModule* module = nullptr;
{
// We parse the module again directly from the module bytes, so
// the underlying storage must not be moved meanwhile.
DisallowHeapAllocation no_allocation;
SeqOneByteString* module_bytes = shared->module_bytes();
const byte* start =
reinterpret_cast<const byte*>(module_bytes->GetCharsAddress());
const byte* end = start + module_bytes->length();
// TODO(titzer): remember the module origin in the compiled_module
// For now, we assume serialized modules did not originate from asm.js.
wasm::ModuleResult result =
SyncDecodeWasmModule(isolate, start, end, false, wasm::kWasmOrigin);
CHECK(result.ok());
CHECK_NOT_NULL(result.val);
// Take ownership of the WasmModule and immediately transfer it to the
// WasmModuleWrapper below.
module = result.val.release();
}
Handle<wasm::WasmModuleWrapper> module_wrapper =
wasm::WasmModuleWrapper::From(isolate, module);
shared->set(kModuleWrapperIndex, *module_wrapper);
DCHECK(WasmSharedModuleData::IsWasmSharedModuleData(*shared));
}
namespace {
int GetBreakpointPos(Isolate* isolate, Object* break_point_info_or_undef) {
if (break_point_info_or_undef->IsUndefined(isolate)) return kMaxInt;
return BreakPointInfo::cast(break_point_info_or_undef)->source_position();
}
int FindBreakpointInfoInsertPos(Isolate* isolate,
Handle<FixedArray> breakpoint_infos,
int position) {
// Find insert location via binary search, taking care of undefined values on
// the right. Position is always greater than zero.
DCHECK_LT(0, position);
int left = 0; // inclusive
int right = breakpoint_infos->length(); // exclusive
while (right - left > 1) {
int mid = left + (right - left) / 2;
Object* mid_obj = breakpoint_infos->get(mid);
if (GetBreakpointPos(isolate, mid_obj) <= position) {
left = mid;
} else {
right = mid;
}
}
int left_pos = GetBreakpointPos(isolate, breakpoint_infos->get(left));
return left_pos < position ? left + 1 : left;
}
} // namespace
void WasmSharedModuleData::AddBreakpoint(Handle<WasmSharedModuleData> shared,
int position,
Handle<Object> break_point_object) {
Isolate* isolate = shared->GetIsolate();
Handle<FixedArray> breakpoint_infos;
if (shared->has_breakpoint_infos()) {
breakpoint_infos = handle(shared->breakpoint_infos(), isolate);
} else {
breakpoint_infos = isolate->factory()->NewFixedArray(4, TENURED);
shared->set(kBreakPointInfosIndex, *breakpoint_infos);
}
int insert_pos =
FindBreakpointInfoInsertPos(isolate, breakpoint_infos, position);
// If a BreakPointInfo object already exists for this position, add the new
// breakpoint object and return.
if (insert_pos < breakpoint_infos->length() &&
GetBreakpointPos(isolate, breakpoint_infos->get(insert_pos)) ==
position) {
Handle<BreakPointInfo> old_info(
BreakPointInfo::cast(breakpoint_infos->get(insert_pos)), isolate);
BreakPointInfo::SetBreakPoint(old_info, break_point_object);
return;
}
// Enlarge break positions array if necessary.
bool need_realloc = !breakpoint_infos->get(breakpoint_infos->length() - 1)
->IsUndefined(isolate);
Handle<FixedArray> new_breakpoint_infos = breakpoint_infos;
if (need_realloc) {
new_breakpoint_infos = isolate->factory()->NewFixedArray(
2 * breakpoint_infos->length(), TENURED);
shared->set(kBreakPointInfosIndex, *new_breakpoint_infos);
// Copy over the entries [0, insert_pos).
for (int i = 0; i < insert_pos; ++i)
new_breakpoint_infos->set(i, breakpoint_infos->get(i));
}
// Move elements [insert_pos+1, ...] up by one.
for (int i = insert_pos + 1; i < breakpoint_infos->length(); ++i) {
Object* entry = breakpoint_infos->get(i);
if (entry->IsUndefined(isolate)) break;
new_breakpoint_infos->set(i + 1, entry);
}
// Generate new BreakpointInfo.
Handle<BreakPointInfo> breakpoint_info =
isolate->factory()->NewBreakPointInfo(position);
BreakPointInfo::SetBreakPoint(breakpoint_info, break_point_object);
// Now insert new position at insert_pos.
new_breakpoint_infos->set(insert_pos, *breakpoint_info);
}
void WasmSharedModuleData::SetBreakpointsOnNewInstance(
Handle<WasmSharedModuleData> shared, Handle<WasmInstanceObject> instance) {
if (!shared->has_breakpoint_infos()) return;
Isolate* isolate = shared->GetIsolate();
Handle<WasmCompiledModule> compiled_module(instance->compiled_module(),
isolate);
Handle<WasmDebugInfo> debug_info =
WasmInstanceObject::GetOrCreateDebugInfo(instance);
Handle<FixedArray> breakpoint_infos(shared->breakpoint_infos(), isolate);
// If the array exists, it should not be empty.
DCHECK_LT(0, breakpoint_infos->length());
for (int i = 0, e = breakpoint_infos->length(); i < e; ++i) {
Handle<Object> obj(breakpoint_infos->get(i), isolate);
if (obj->IsUndefined(isolate)) {
for (; i < e; ++i) {
DCHECK(breakpoint_infos->get(i)->IsUndefined(isolate));
}
break;
}
Handle<BreakPointInfo> breakpoint_info = Handle<BreakPointInfo>::cast(obj);
int position = breakpoint_info->source_position();
// Find the function for this breakpoint, and set the breakpoint.
int func_index = compiled_module->GetContainingFunction(position);
DCHECK_LE(0, func_index);
WasmFunction& func = compiled_module->module()->functions[func_index];
int offset_in_func = position - func.code.offset();
WasmDebugInfo::SetBreakpoint(debug_info, func_index, offset_in_func);
}
}
void WasmSharedModuleData::PrepareForLazyCompilation(
Handle<WasmSharedModuleData> shared) {
if (shared->has_lazy_compilation_orchestrator()) return;
Isolate* isolate = shared->GetIsolate();
auto orch_handle =
Managed<wasm::LazyCompilationOrchestrator>::Allocate(isolate);
shared->set_lazy_compilation_orchestrator(*orch_handle);
}
Handle<WasmCompiledModule> WasmCompiledModule::New(
Isolate* isolate, Handle<WasmSharedModuleData> shared,
Handle<FixedArray> code_table, Handle<FixedArray> export_wrappers,
const std::vector<GlobalHandleAddress>& function_tables,
const std::vector<GlobalHandleAddress>& signature_tables) {
DCHECK_EQ(function_tables.size(), signature_tables.size());
Handle<FixedArray> ret =
isolate->factory()->NewFixedArray(PropertyIndices::Count, TENURED);
// WasmCompiledModule::cast would fail since fields are not set yet.
Handle<WasmCompiledModule> compiled_module(
reinterpret_cast<WasmCompiledModule*>(*ret), isolate);
compiled_module->InitId();
compiled_module->set_shared(shared);
compiled_module->set_native_context(isolate->native_context());
compiled_module->set_code_table(code_table);
compiled_module->set_export_wrappers(export_wrappers);
// TODO(mtrofin): we copy these because the order of finalization isn't
// reliable, and we need these at Reset (which is called at
// finalization). If the order were reliable, and top-down, we could instead
// just get them from shared().
compiled_module->set_initial_pages(shared->module()->initial_pages);
compiled_module->set_num_imported_functions(
shared->module()->num_imported_functions);
int num_function_tables = static_cast<int>(function_tables.size());
if (num_function_tables > 0) {
Handle<FixedArray> st =
isolate->factory()->NewFixedArray(num_function_tables, TENURED);
Handle<FixedArray> ft =
isolate->factory()->NewFixedArray(num_function_tables, TENURED);
for (int i = 0; i < num_function_tables; ++i) {
size_t index = static_cast<size_t>(i);
SetTableValue(isolate, ft, i, function_tables[index]);
SetTableValue(isolate, st, i, signature_tables[index]);
}
// TODO(wasm): setting the empty tables here this way is OK under the
// assumption that we compile and then instantiate. It needs rework if we do
// direct instantiation. The empty tables are used as a default when
// resetting the compiled module.
compiled_module->set_signature_tables(st);
compiled_module->set_empty_signature_tables(st);
compiled_module->set_function_tables(ft);
compiled_module->set_empty_function_tables(ft);
}
// TODO(mtrofin): copy the rest of the specialization parameters over.
// We're currently OK because we're only using defaults.
return compiled_module;
}
Handle<WasmCompiledModule> WasmCompiledModule::Clone(
Isolate* isolate, Handle<WasmCompiledModule> module) {
Handle<FixedArray> code_copy =
isolate->factory()->CopyFixedArray(module->code_table());
Handle<WasmCompiledModule> ret = Handle<WasmCompiledModule>::cast(
isolate->factory()->CopyFixedArray(module));
ret->InitId();
ret->set_code_table(code_copy);
ret->reset_weak_owning_instance();
ret->reset_weak_next_instance();
ret->reset_weak_prev_instance();
ret->reset_weak_exported_functions();
return ret;
}
void WasmCompiledModule::SetTableValue(Isolate* isolate,
Handle<FixedArray> table, int index,
Address value) {
Handle<HeapNumber> number = isolate->factory()->NewHeapNumber(
static_cast<double>(reinterpret_cast<size_t>(value)), MUTABLE, TENURED);
table->set(index, *number);
}
void WasmCompiledModule::UpdateTableValue(FixedArray* table, int index,
Address value) {
DisallowHeapAllocation no_gc;
HeapNumber::cast(table->get(index))
->set_value(static_cast<double>(reinterpret_cast<size_t>(value)));
}
Address WasmCompiledModule::GetTableValue(FixedArray* table, int index) {
DisallowHeapAllocation no_gc;
double value = HeapNumber::cast(table->get(index))->value();
return reinterpret_cast<Address>(static_cast<size_t>(value));
}
void WasmCompiledModule::Reset(Isolate* isolate,
WasmCompiledModule* compiled_module) {
DisallowHeapAllocation no_gc;
TRACE("Resetting %d\n", compiled_module->instance_id());
Object* undefined = *isolate->factory()->undefined_value();
Object* fct_obj = compiled_module->ptr_to_code_table();
if (fct_obj != nullptr && fct_obj != undefined) {
// Patch code to update memory references, global references, and function
// table references.
Zone specialization_zone(isolate->allocator(), ZONE_NAME);
wasm::CodeSpecialization code_specialization(isolate, &specialization_zone);
// Reset function tables.
if (compiled_module->has_function_tables()) {
FixedArray* function_tables = compiled_module->ptr_to_function_tables();
FixedArray* signature_tables = compiled_module->ptr_to_signature_tables();
FixedArray* empty_function_tables =
compiled_module->ptr_to_empty_function_tables();
FixedArray* empty_signature_tables =
compiled_module->ptr_to_empty_signature_tables();
if (function_tables != empty_function_tables) {
DCHECK_EQ(function_tables->length(), empty_function_tables->length());
for (int i = 0, e = function_tables->length(); i < e; ++i) {
GlobalHandleAddress func_addr =
WasmCompiledModule::GetTableValue(function_tables, i);
GlobalHandleAddress sig_addr =
WasmCompiledModule::GetTableValue(signature_tables, i);
code_specialization.RelocatePointer(
func_addr,
WasmCompiledModule::GetTableValue(empty_function_tables, i));
code_specialization.RelocatePointer(
sig_addr,
WasmCompiledModule::GetTableValue(empty_signature_tables, i));
}
compiled_module->set_ptr_to_function_tables(empty_function_tables);
compiled_module->set_ptr_to_signature_tables(empty_signature_tables);
}
}
FixedArray* functions = FixedArray::cast(fct_obj);
for (int i = compiled_module->num_imported_functions(),
end = functions->length();
i < end; ++i) {
Code* code = Code::cast(functions->get(i));
// Skip lazy compile stubs.
if (code->builtin_index() == Builtins::kWasmCompileLazy) continue;
if (code->kind() != Code::WASM_FUNCTION) {
// From here on, there should only be wrappers for exported functions.
for (; i < end; ++i) {
DCHECK_EQ(Code::JS_TO_WASM_FUNCTION,
Code::cast(functions->get(i))->kind());
}
break;
}
bool changed =
code_specialization.ApplyToWasmCode(code, SKIP_ICACHE_FLUSH);
// TODO(wasm): Check if this is faster than passing FLUSH_ICACHE_IF_NEEDED
// above.
if (changed) {
Assembler::FlushICache(isolate, code->instruction_start(),
code->instruction_size());
}
}
}
}
void WasmCompiledModule::InitId() {
#if DEBUG
static uint32_t instance_id_counter = 0;
set(kID_instance_id, Smi::FromInt(instance_id_counter++));
TRACE("New compiled module id: %d\n", instance_id());
#endif
}
MaybeHandle<String> WasmCompiledModule::ExtractUtf8StringFromModuleBytes(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module,
wasm::WireBytesRef ref) {
// TODO(wasm): cache strings from modules if it's a performance win.
Handle<SeqOneByteString> module_bytes(compiled_module->module_bytes(),
isolate);
return WasmCompiledModule::ExtractUtf8StringFromModuleBytes(
isolate, module_bytes, ref);
}
MaybeHandle<String> WasmCompiledModule::ExtractUtf8StringFromModuleBytes(
Isolate* isolate, Handle<SeqOneByteString> module_bytes,
wasm::WireBytesRef ref) {
DCHECK_GE(module_bytes->length(), ref.end_offset());
// UTF8 validation happens at decode time.
DCHECK(unibrow::Utf8::ValidateEncoding(
reinterpret_cast<const byte*>(module_bytes->GetCharsAddress() +
ref.offset()),
ref.length()));
DCHECK_GE(kMaxInt, ref.offset());
DCHECK_GE(kMaxInt, ref.length());
return isolate->factory()->NewStringFromUtf8SubString(
module_bytes, static_cast<int>(ref.offset()),
static_cast<int>(ref.length()));
}
bool WasmCompiledModule::IsWasmCompiledModule(Object* obj) {
if (!obj->IsFixedArray()) return false;
FixedArray* arr = FixedArray::cast(obj);
if (arr->length() != PropertyIndices::Count) return false;
#define WCM_CHECK_TYPE(NAME, TYPE_CHECK) \
do { \
Object* obj = arr->get(kID_##NAME); \
if (!(TYPE_CHECK)) return false; \
} while (false);
// We're OK with undefined, generally, because maybe we don't
// have a value for that item. For example, we may not have a
// memory, or globals.
// We're not OK with the const numbers being undefined. They are
// expected to be initialized at construction.
#define WCM_CHECK_OBJECT(TYPE, NAME) \
WCM_CHECK_TYPE(NAME, obj->IsUndefined(isolate) || obj->Is##TYPE())
#define WCM_CHECK_CONST_OBJECT(TYPE, NAME) \
WCM_CHECK_TYPE(NAME, obj->IsUndefined(isolate) || obj->Is##TYPE())
#define WCM_CHECK_WASM_OBJECT(TYPE, NAME) \
WCM_CHECK_TYPE(NAME, TYPE::Is##TYPE(obj))
#define WCM_CHECK_WEAK_LINK(TYPE, NAME) WCM_CHECK_OBJECT(WeakCell, NAME)
#define WCM_CHECK_SMALL_NUMBER(TYPE, NAME) \
WCM_CHECK_TYPE(NAME, obj->IsUndefined(isolate) || obj->IsSmi())
#define WCM_CHECK(KIND, TYPE, NAME) WCM_CHECK_##KIND(TYPE, NAME)
#define WCM_CHECK_SMALL_CONST_NUMBER(TYPE, NAME) \
WCM_CHECK_TYPE(NAME, obj->IsSmi())
#undef WCM_CHECK_TYPE
#undef WCM_CHECK_OBJECT
#undef WCM_CHECK_CONST_OBJECT
#undef WCM_CHECK_WASM_OBJECT
#undef WCM_CHECK_WEAK_LINK
#undef WCM_CHECK_SMALL_NUMBER
#undef WCM_CHECK
#undef WCM_CHECK_SMALL_CONST_NUMBER
// All checks passed.
return true;
}
void WasmCompiledModule::PrintInstancesChain() {
#if DEBUG
if (!FLAG_trace_wasm_instances) return;
for (WasmCompiledModule* current = this; current != nullptr;) {
PrintF("->%d", current->instance_id());
if (!current->has_weak_next_instance()) break;
DCHECK(!current->ptr_to_weak_next_instance()->cleared());
current =
WasmCompiledModule::cast(current->ptr_to_weak_next_instance()->value());
}
PrintF("\n");
#endif
}
void WasmCompiledModule::ReinitializeAfterDeserialization(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
// This method must only be called immediately after deserialization.
// At this point, no module wrapper exists, so the shared module data is
// incomplete.
Handle<WasmSharedModuleData> shared(
static_cast<WasmSharedModuleData*>(compiled_module->get(kID_shared)),
isolate);
DCHECK(!WasmSharedModuleData::IsWasmSharedModuleData(*shared));
WasmSharedModuleData::ReinitializeAfterDeserialization(isolate, shared);
int function_table_count =
static_cast<int>(compiled_module->module()->function_tables.size());
if (function_table_count > 0) {
// The tables are of the right size, but contain bogus global handle
// addresses. Produce new global handles for the empty tables, then reset,
// which will relocate the code. We end up with a WasmCompiledModule as-if
// it were just compiled.
DCHECK(compiled_module->has_function_tables());
DCHECK(compiled_module->has_signature_tables());
DCHECK(compiled_module->has_empty_signature_tables());
DCHECK(compiled_module->has_empty_function_tables());
for (int i = 0; i < function_table_count; ++i) {
Handle<Object> global_func_table_handle =
isolate->global_handles()->Create(isolate->heap()->undefined_value());
Handle<Object> global_sig_table_handle =
isolate->global_handles()->Create(isolate->heap()->undefined_value());
GlobalHandleAddress new_func_table = global_func_table_handle.address();
GlobalHandleAddress new_sig_table = global_sig_table_handle.address();
SetTableValue(isolate, compiled_module->empty_function_tables(), i,
new_func_table);
SetTableValue(isolate, compiled_module->empty_signature_tables(), i,
new_sig_table);
}
}
// Reset, but don't delete any global handles, because their owning instance
// may still be active.
WasmCompiledModule::Reset(isolate, *compiled_module);
DCHECK(WasmSharedModuleData::IsWasmSharedModuleData(*shared));
}
uint32_t WasmCompiledModule::default_mem_size() const {
return initial_pages() * WasmModule::kPageSize;
}
MaybeHandle<String> WasmCompiledModule::GetModuleNameOrNull(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module) {
WasmModule* module = compiled_module->module();
if (!module->name.is_set()) return {};
return WasmCompiledModule::ExtractUtf8StringFromModuleBytes(
isolate, compiled_module, module->name);
}
MaybeHandle<String> WasmCompiledModule::GetFunctionNameOrNull(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module,
uint32_t func_index) {
DCHECK_LT(func_index, compiled_module->module()->functions.size());
WasmFunction& function = compiled_module->module()->functions[func_index];
if (!function.name.is_set()) return {};
return WasmCompiledModule::ExtractUtf8StringFromModuleBytes(
isolate, compiled_module, function.name);
}
Handle<String> WasmCompiledModule::GetFunctionName(
Isolate* isolate, Handle<WasmCompiledModule> compiled_module,
uint32_t func_index) {
MaybeHandle<String> name =
GetFunctionNameOrNull(isolate, compiled_module, func_index);
if (!name.is_null()) return name.ToHandleChecked();
return isolate->factory()->NewStringFromStaticChars("<WASM UNNAMED>");
}
Vector<const uint8_t> WasmCompiledModule::GetRawFunctionName(
uint32_t func_index) {
DCHECK_GT(module()->functions.size(), func_index);
WasmFunction& function = module()->functions[func_index];
SeqOneByteString* bytes = module_bytes();
DCHECK_GE(bytes->length(), function.name.end_offset());
return Vector<const uint8_t>(
bytes->GetCharsAddress() + function.name.offset(),
function.name.length());
}
int WasmCompiledModule::GetFunctionOffset(uint32_t func_index) {
std::vector<WasmFunction>& functions = module()->functions;
if (static_cast<uint32_t>(func_index) >= functions.size()) return -1;
DCHECK_GE(kMaxInt, functions[func_index].code.offset());
return static_cast<int>(functions[func_index].code.offset());
}
int WasmCompiledModule::GetContainingFunction(uint32_t byte_offset) {
std::vector<WasmFunction>& functions = module()->functions;
// Binary search for a function containing the given position.
int left = 0; // inclusive
int right = static_cast<int>(functions.size()); // exclusive
if (right == 0) return false;
while (right - left > 1) {
int mid = left + (right - left) / 2;
if (functions[mid].code.offset() <= byte_offset) {
left = mid;
} else {
right = mid;
}
}
// If the found function does not contains the given position, return -1.
WasmFunction& func = functions[left];
if (byte_offset < func.code.offset() ||
byte_offset >= func.code.end_offset()) {
return -1;
}
return left;
}
bool WasmCompiledModule::GetPositionInfo(uint32_t position,
Script::PositionInfo* info) {
int func_index = GetContainingFunction(position);
if (func_index < 0) return false;
WasmFunction& function = module()->functions[func_index];
info->line = func_index;
info->column = position - function.code.offset();
info->line_start = function.code.offset();
info->line_end = function.code.end_offset();
return true;
}
namespace {
enum AsmJsOffsetTableEntryLayout {
kOTEByteOffset,
kOTECallPosition,
kOTENumberConvPosition,
kOTESize
};
Handle<ByteArray> GetDecodedAsmJsOffsetTable(
Handle<WasmCompiledModule> compiled_module, Isolate* isolate) {
DCHECK(compiled_module->is_asm_js());
Handle<ByteArray> offset_table(
compiled_module->shared()->asm_js_offset_table(), isolate);
// The last byte in the asm_js_offset_tables ByteArray tells whether it is
// still encoded (0) or decoded (1).
enum AsmJsTableType : int { Encoded = 0, Decoded = 1 };
int table_type = offset_table->get(offset_table->length() - 1);
DCHECK(table_type == Encoded || table_type == Decoded);
if (table_type == Decoded) return offset_table;
wasm::AsmJsOffsetsResult asm_offsets;
{
DisallowHeapAllocation no_gc;
const byte* bytes_start = offset_table->GetDataStartAddress();
const byte* bytes_end = bytes_start + offset_table->length() - 1;
asm_offsets = wasm::DecodeAsmJsOffsets(bytes_start, bytes_end);
}
// Wasm bytes must be valid and must contain asm.js offset table.
DCHECK(asm_offsets.ok());
DCHECK_GE(kMaxInt, asm_offsets.val.size());
int num_functions = static_cast<int>(asm_offsets.val.size());
int num_imported_functions =
static_cast<int>(compiled_module->module()->num_imported_functions);
DCHECK_EQ(compiled_module->module()->functions.size(),
static_cast<size_t>(num_functions) + num_imported_functions);
int num_entries = 0;
for (int func = 0; func < num_functions; ++func) {
size_t new_size = asm_offsets.val[func].size();
DCHECK_LE(new_size, static_cast<size_t>(kMaxInt) - num_entries);
num_entries += static_cast<int>(new_size);
}
// One byte to encode that this is a decoded table.
DCHECK_GE(kMaxInt,
1 + static_cast<uint64_t>(num_entries) * kOTESize * kIntSize);
int total_size = 1 + num_entries * kOTESize * kIntSize;
Handle<ByteArray> decoded_table =
isolate->factory()->NewByteArray(total_size, TENURED);
decoded_table->set(total_size - 1, AsmJsTableType::Decoded);
compiled_module->shared()->set_asm_js_offset_table(*decoded_table);
int idx = 0;
std::vector<WasmFunction>& wasm_funs = compiled_module->module()->functions;
for (int func = 0; func < num_functions; ++func) {
std::vector<wasm::AsmJsOffsetEntry>& func_asm_offsets =
asm_offsets.val[func];
if (func_asm_offsets.empty()) continue;
int func_offset = wasm_funs[num_imported_functions + func].code.offset();
for (wasm::AsmJsOffsetEntry& e : func_asm_offsets) {
// Byte offsets must be strictly monotonously increasing:
DCHECK_IMPLIES(idx > 0, func_offset + e.byte_offset >
decoded_table->get_int(idx - kOTESize));
decoded_table->set_int(idx + kOTEByteOffset, func_offset + e.byte_offset);
decoded_table->set_int(idx + kOTECallPosition, e.source_position_call);
decoded_table->set_int(idx + kOTENumberConvPosition,
e.source_position_number_conversion);
idx += kOTESize;
}
}
DCHECK_EQ(total_size, idx * kIntSize + 1);
return decoded_table;
}
} // namespace
int WasmCompiledModule::GetSourcePosition(
Handle<WasmCompiledModule> compiled_module, uint32_t func_index,
uint32_t byte_offset, bool is_at_number_conversion) {
Isolate* isolate = compiled_module->GetIsolate();
const WasmModule* module = compiled_module->module();
if (!module->is_asm_js()) {
// for non-asm.js modules, we just add the function's start offset
// to make a module-relative position.
return byte_offset + compiled_module->GetFunctionOffset(func_index);
}
// asm.js modules have an additional offset table that must be searched.
Handle<ByteArray> offset_table =
GetDecodedAsmJsOffsetTable(compiled_module, isolate);
DCHECK_LT(func_index, module->functions.size());
uint32_t func_code_offset = module->functions[func_index].code.offset();
uint32_t total_offset = func_code_offset + byte_offset;
// Binary search for the total byte offset.
int left = 0; // inclusive
int right = offset_table->length() / kIntSize / kOTESize; // exclusive
DCHECK_LT(left, right);
while (right - left > 1) {
int mid = left + (right - left) / 2;
int mid_entry = offset_table->get_int(kOTESize * mid);
DCHECK_GE(kMaxInt, mid_entry);
if (static_cast<uint32_t>(mid_entry) <= total_offset) {
left = mid;
} else {
right = mid;
}
}
// There should be an entry for each position that could show up on the stack
// trace:
DCHECK_EQ(total_offset, offset_table->get_int(kOTESize * left));
int idx = is_at_number_conversion ? kOTENumberConvPosition : kOTECallPosition;
return offset_table->get_int(kOTESize * left + idx);
}
v8::debug::WasmDisassembly WasmCompiledModule::DisassembleFunction(
int func_index) {
DisallowHeapAllocation no_gc;
if (func_index < 0 ||
static_cast<uint32_t>(func_index) >= module()->functions.size())
return {};
SeqOneByteString* module_bytes_str = module_bytes();
Vector<const byte> module_bytes(module_bytes_str->GetChars(),
module_bytes_str->length());
std::ostringstream disassembly_os;
v8::debug::WasmDisassembly::OffsetTable offset_table;
PrintWasmText(module(), module_bytes, static_cast<uint32_t>(func_index),
disassembly_os, &offset_table);
return {disassembly_os.str(), std::move(offset_table)};
}
bool WasmCompiledModule::GetPossibleBreakpoints(
const v8::debug::Location& start, const v8::debug::Location& end,
std::vector<v8::debug::BreakLocation>* locations) {
DisallowHeapAllocation no_gc;
std::vector<WasmFunction>& functions = module()->functions;
if (start.GetLineNumber() < 0 || start.GetColumnNumber() < 0 ||
(!end.IsEmpty() &&
(end.GetLineNumber() < 0 || end.GetColumnNumber() < 0)))
return false;
// start_func_index, start_offset and end_func_index is inclusive.
// end_offset is exclusive.
// start_offset and end_offset are module-relative byte offsets.
uint32_t start_func_index = start.GetLineNumber();
if (start_func_index >= functions.size()) return false;
int start_func_len = functions[start_func_index].code.length();
if (start.GetColumnNumber() > start_func_len) return false;
uint32_t start_offset =
functions[start_func_index].code.offset() + start.GetColumnNumber();
uint32_t end_func_index;
uint32_t end_offset;
if (end.IsEmpty()) {
// Default: everything till the end of the Script.
end_func_index = static_cast<uint32_t>(functions.size() - 1);
end_offset = functions[end_func_index].code.end_offset();
} else {
// If end is specified: Use it and check for valid input.
end_func_index = static_cast<uint32_t>(end.GetLineNumber());
// Special case: Stop before the start of the next function. Change to: Stop
// at the end of the function before, such that we don't disassemble the
// next function also.
if (end.GetColumnNumber() == 0 && end_func_index > 0) {
--end_func_index;
end_offset = functions[end_func_index].code.end_offset();
} else {
if (end_func_index >= functions.size()) return false;
end_offset =
functions[end_func_index].code.offset() + end.GetColumnNumber();
if (end_offset > functions[end_func_index].code.end_offset())
return false;
}
}
AccountingAllocator alloc;
Zone tmp(&alloc, ZONE_NAME);
const byte* module_start = module_bytes()->GetChars();
for (uint32_t func_idx = start_func_index; func_idx <= end_func_index;
++func_idx) {
WasmFunction& func = functions[func_idx];
if (func.code.length() == 0) continue;
wasm::BodyLocalDecls locals(&tmp);
wasm::BytecodeIterator iterator(module_start + func.code.offset(),
module_start + func.code.end_offset(),
&locals);
DCHECK_LT(0u, locals.encoded_size);
for (uint32_t offset : iterator.offsets()) {
uint32_t total_offset = func.code.offset() + offset;
if (total_offset >= end_offset) {
DCHECK_EQ(end_func_index, func_idx);
break;
}
if (total_offset < start_offset) continue;
locations->emplace_back(func_idx, offset, debug::kCommonBreakLocation);
}
}
return true;
}
bool WasmCompiledModule::SetBreakPoint(
Handle<WasmCompiledModule> compiled_module, int* position,
Handle<Object> break_point_object) {
Isolate* isolate = compiled_module->GetIsolate();
// Find the function for this breakpoint.
int func_index = compiled_module->GetContainingFunction(*position);
if (func_index < 0) return false;
WasmFunction& func = compiled_module->module()->functions[func_index];
int offset_in_func = *position - func.code.offset();
// According to the current design, we should only be called with valid
// breakable positions.
DCHECK(IsBreakablePosition(compiled_module, func_index, offset_in_func));
// Insert new break point into break_positions of shared module data.
WasmSharedModuleData::AddBreakpoint(compiled_module->shared(), *position,
break_point_object);
// Iterate over all instances of this module and tell them to set this new
// breakpoint.
for (Handle<WasmInstanceObject> instance :
iterate_compiled_module_instance_chain(isolate, compiled_module)) {
Handle<WasmDebugInfo> debug_info =
WasmInstanceObject::GetOrCreateDebugInfo(instance);
WasmDebugInfo::SetBreakpoint(debug_info, func_index, offset_in_func);
}
return true;
}
MaybeHandle<FixedArray> WasmCompiledModule::CheckBreakPoints(int position) {
Isolate* isolate = GetIsolate();
if (!shared()->has_breakpoint_infos()) return {};
Handle<FixedArray> breakpoint_infos(shared()->breakpoint_infos(), isolate);
int insert_pos =
FindBreakpointInfoInsertPos(isolate, breakpoint_infos, position);
if (insert_pos >= breakpoint_infos->length()) return {};
Handle<Object> maybe_breakpoint_info(breakpoint_infos->get(insert_pos),
isolate);
if (maybe_breakpoint_info->IsUndefined(isolate)) return {};
Handle<BreakPointInfo> breakpoint_info =
Handle<BreakPointInfo>::cast(maybe_breakpoint_info);
if (breakpoint_info->source_position() != position) return {};
Handle<Object> breakpoint_objects(breakpoint_info->break_point_objects(),
isolate);
return isolate->debug()->GetHitBreakPointObjects(breakpoint_objects);
}
Handle<Code> WasmCompiledModule::CompileLazy(
Isolate* isolate, Handle<WasmInstanceObject> instance, Handle<Code> caller,
int offset, int func_index, bool patch_caller) {
isolate->set_context(*instance->compiled_module()->native_context());
Object* orch_obj =
instance->compiled_module()->shared()->lazy_compilation_orchestrator();
auto* orch =
Managed<wasm::LazyCompilationOrchestrator>::cast(orch_obj)->get();
return orch->CompileLazy(isolate, instance, caller, offset, func_index,
patch_caller);
}
#undef TRACE
} // namespace internal
} // namespace v8