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// 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 <functional>
#include <memory>
#include "src/api/api-inl.h"
#include "src/codegen/assembler-inl.h"
#include "src/compiler/wasm-compiler.h"
#include "src/debug/interface-types.h"
#include "src/execution/frames-inl.h"
#include "src/execution/simulator.h"
#include "src/init/v8.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/objects.h"
#include "src/objects/property-descriptor.h"
#include "src/snapshot/snapshot.h"
#include "src/wasm/module-decoder.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-js.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-result.h"
namespace v8 {
namespace internal {
namespace wasm {
// static
const uint32_t WasmElemSegment::kNullIndex;
WireBytesRef WasmModule::LookupFunctionName(const ModuleWireBytes& wire_bytes,
uint32_t function_index) const {
if (!function_names) {
function_names.reset(new std::unordered_map<uint32_t, WireBytesRef>());
DecodeFunctionNames(wire_bytes.start(), wire_bytes.end(),
function_names.get());
}
auto it = function_names->find(function_index);
if (it == function_names->end()) return WireBytesRef();
return it->second;
}
// static
int MaxNumExportWrappers(const WasmModule* module) {
// For each signature there may exist a wrapper, both for imported and
// internal functions.
return static_cast<int>(module->signature_map.size()) * 2;
}
// static
int GetExportWrapperIndex(const WasmModule* module, const FunctionSig* sig,
bool is_import) {
int result = module->signature_map.Find(*sig);
CHECK_GE(result, 0);
result += is_import ? module->signature_map.size() : 0;
return result;
}
void WasmModule::AddFunctionNameForTesting(int function_index,
WireBytesRef name) {
if (!function_names) {
function_names.reset(new std::unordered_map<uint32_t, WireBytesRef>());
}
function_names->insert(std::make_pair(function_index, name));
}
// Get a string stored in the module bytes representing a name.
WasmName ModuleWireBytes::GetNameOrNull(WireBytesRef ref) const {
if (!ref.is_set()) return {nullptr, 0}; // no name.
CHECK(BoundsCheck(ref.offset(), ref.length()));
return WasmName::cast(
module_bytes_.SubVector(ref.offset(), ref.end_offset()));
}
// Get a string stored in the module bytes representing a function name.
WasmName ModuleWireBytes::GetNameOrNull(const WasmFunction* function,
const WasmModule* module) const {
return GetNameOrNull(module->LookupFunctionName(*this, function->func_index));
}
std::ostream& operator<<(std::ostream& os, const WasmFunctionName& name) {
os << "#" << name.function_->func_index;
if (!name.name_.empty()) {
if (name.name_.begin()) {
os << ":";
os.write(name.name_.begin(), name.name_.length());
}
} else {
os << "?";
}
return os;
}
WasmModule::WasmModule(std::unique_ptr<Zone> signature_zone)
: signature_zone(std::move(signature_zone)) {}
bool IsWasmCodegenAllowed(Isolate* isolate, Handle<Context> context) {
// TODO(wasm): Once wasm has its own CSP policy, we should introduce a
// separate callback that includes information about the module about to be
// compiled. For the time being, pass an empty string as placeholder for the
// sources.
if (auto wasm_codegen_callback = isolate->allow_wasm_code_gen_callback()) {
return wasm_codegen_callback(
v8::Utils::ToLocal(context),
v8::Utils::ToLocal(isolate->factory()->empty_string()));
}
auto codegen_callback = isolate->allow_code_gen_callback();
return codegen_callback == nullptr ||
codegen_callback(
v8::Utils::ToLocal(context),
v8::Utils::ToLocal(isolate->factory()->empty_string()));
}
namespace {
// Converts the given {type} into a string representation that can be used in
// reflective functions. Should be kept in sync with the {GetValueType} helper.
Handle<String> ToValueTypeString(Isolate* isolate, ValueType type) {
Factory* factory = isolate->factory();
Handle<String> string;
switch (type) {
case i::wasm::kWasmI32: {
string = factory->InternalizeUtf8String("i32");
break;
}
case i::wasm::kWasmI64: {
string = factory->InternalizeUtf8String("i64");
break;
}
case i::wasm::kWasmF32: {
string = factory->InternalizeUtf8String("f32");
break;
}
case i::wasm::kWasmF64: {
string = factory->InternalizeUtf8String("f64");
break;
}
case i::wasm::kWasmAnyRef: {
string = factory->InternalizeUtf8String("anyref");
break;
}
case i::wasm::kWasmFuncRef: {
string = factory->InternalizeUtf8String("anyfunc");
break;
}
case i::wasm::kWasmExnRef: {
string = factory->InternalizeUtf8String("exnref");
break;
}
default:
UNREACHABLE();
}
return string;
}
} // namespace
Handle<JSObject> GetTypeForFunction(Isolate* isolate, FunctionSig* sig) {
Factory* factory = isolate->factory();
// Extract values for the {ValueType[]} arrays.
int param_index = 0;
int param_count = static_cast<int>(sig->parameter_count());
Handle<FixedArray> param_values = factory->NewFixedArray(param_count);
for (ValueType type : sig->parameters()) {
Handle<String> type_value = ToValueTypeString(isolate, type);
param_values->set(param_index++, *type_value);
}
int result_index = 0;
int result_count = static_cast<int>(sig->return_count());
Handle<FixedArray> result_values = factory->NewFixedArray(result_count);
for (ValueType type : sig->returns()) {
Handle<String> type_value = ToValueTypeString(isolate, type);
result_values->set(result_index++, *type_value);
}
// Create the resulting {FunctionType} object.
Handle<JSFunction> object_function = isolate->object_function();
Handle<JSObject> object = factory->NewJSObject(object_function);
Handle<JSArray> params = factory->NewJSArrayWithElements(param_values);
Handle<JSArray> results = factory->NewJSArrayWithElements(result_values);
Handle<String> params_string = factory->InternalizeUtf8String("parameters");
Handle<String> results_string = factory->InternalizeUtf8String("results");
JSObject::AddProperty(isolate, object, params_string, params, NONE);
JSObject::AddProperty(isolate, object, results_string, results, NONE);
return object;
}
Handle<JSObject> GetTypeForGlobal(Isolate* isolate, bool is_mutable,
ValueType type) {
Factory* factory = isolate->factory();
Handle<JSFunction> object_function = isolate->object_function();
Handle<JSObject> object = factory->NewJSObject(object_function);
Handle<String> mutable_string = factory->InternalizeUtf8String("mutable");
Handle<String> value_string = factory->InternalizeUtf8String("value");
JSObject::AddProperty(isolate, object, mutable_string,
factory->ToBoolean(is_mutable), NONE);
JSObject::AddProperty(isolate, object, value_string,
ToValueTypeString(isolate, type), NONE);
return object;
}
Handle<JSObject> GetTypeForMemory(Isolate* isolate, uint32_t min_size,
base::Optional<uint32_t> max_size) {
Factory* factory = isolate->factory();
Handle<JSFunction> object_function = isolate->object_function();
Handle<JSObject> object = factory->NewJSObject(object_function);
Handle<String> minimum_string = factory->InternalizeUtf8String("minimum");
Handle<String> maximum_string = factory->InternalizeUtf8String("maximum");
JSObject::AddProperty(isolate, object, minimum_string,
factory->NewNumberFromUint(min_size), NONE);
if (max_size.has_value()) {
JSObject::AddProperty(isolate, object, maximum_string,
factory->NewNumberFromUint(max_size.value()), NONE);
}
return object;
}
Handle<JSObject> GetTypeForTable(Isolate* isolate, ValueType type,
uint32_t min_size,
base::Optional<uint32_t> max_size) {
Factory* factory = isolate->factory();
Handle<String> element;
if (type == ValueType::kWasmFuncRef) {
// TODO(wasm): We should define the "anyfunc" string in one central place
// and then use that constant everywhere.
element = factory->InternalizeUtf8String("anyfunc");
} else {
DCHECK(WasmFeaturesFromFlags().anyref && type == ValueType::kWasmAnyRef);
element = factory->InternalizeUtf8String("anyref");
}
Handle<JSFunction> object_function = isolate->object_function();
Handle<JSObject> object = factory->NewJSObject(object_function);
Handle<String> element_string = factory->InternalizeUtf8String("element");
Handle<String> minimum_string = factory->InternalizeUtf8String("minimum");
Handle<String> maximum_string = factory->InternalizeUtf8String("maximum");
JSObject::AddProperty(isolate, object, element_string, element, NONE);
JSObject::AddProperty(isolate, object, minimum_string,
factory->NewNumberFromUint(min_size), NONE);
if (max_size.has_value()) {
JSObject::AddProperty(isolate, object, maximum_string,
factory->NewNumberFromUint(max_size.value()), NONE);
}
return object;
}
Handle<JSArray> GetImports(Isolate* isolate,
Handle<WasmModuleObject> module_object) {
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(isolate);
Factory* factory = isolate->factory();
Handle<String> module_string = factory->InternalizeUtf8String("module");
Handle<String> name_string = factory->InternalizeUtf8String("name");
Handle<String> kind_string = factory->InternalizeUtf8String("kind");
Handle<String> type_string = factory->InternalizeUtf8String("type");
Handle<String> function_string = factory->InternalizeUtf8String("function");
Handle<String> table_string = factory->InternalizeUtf8String("table");
Handle<String> memory_string = factory->InternalizeUtf8String("memory");
Handle<String> global_string = factory->InternalizeUtf8String("global");
Handle<String> exception_string = factory->InternalizeUtf8String("exception");
// Create the result array.
const WasmModule* module = module_object->module();
int num_imports = static_cast<int>(module->import_table.size());
Handle<JSArray> array_object = factory->NewJSArray(PACKED_ELEMENTS, 0, 0);
Handle<FixedArray> storage = factory->NewFixedArray(num_imports);
JSArray::SetContent(array_object, storage);
array_object->set_length(Smi::FromInt(num_imports));
Handle<JSFunction> object_function =
Handle<JSFunction>(isolate->native_context()->object_function(), isolate);
// Populate the result array.
for (int index = 0; index < num_imports; ++index) {
const WasmImport& import = module->import_table[index];
Handle<JSObject> entry = factory->NewJSObject(object_function);
Handle<String> import_kind;
Handle<JSObject> type_value;
switch (import.kind) {
case kExternalFunction:
if (enabled_features.type_reflection) {
auto& func = module->functions[import.index];
type_value = GetTypeForFunction(isolate, func.sig);
}
import_kind = function_string;
break;
case kExternalTable:
if (enabled_features.type_reflection) {
auto& table = module->tables[import.index];
base::Optional<uint32_t> maximum_size;
if (table.has_maximum_size) maximum_size.emplace(table.maximum_size);
type_value = GetTypeForTable(isolate, table.type, table.initial_size,
maximum_size);
}
import_kind = table_string;
break;
case kExternalMemory:
if (enabled_features.type_reflection) {
DCHECK_EQ(0, import.index); // Only one memory supported.
base::Optional<uint32_t> maximum_size;
if (module->has_maximum_pages) {
maximum_size.emplace(module->maximum_pages);
}
type_value =
GetTypeForMemory(isolate, module->initial_pages, maximum_size);
}
import_kind = memory_string;
break;
case kExternalGlobal:
if (enabled_features.type_reflection) {
auto& global = module->globals[import.index];
type_value =
GetTypeForGlobal(isolate, global.mutability, global.type);
}
import_kind = global_string;
break;
case kExternalException:
import_kind = exception_string;
break;
default:
UNREACHABLE();
}
MaybeHandle<String> import_module =
WasmModuleObject::ExtractUtf8StringFromModuleBytes(
isolate, module_object, import.module_name);
MaybeHandle<String> import_name =
WasmModuleObject::ExtractUtf8StringFromModuleBytes(
isolate, module_object, import.field_name);
JSObject::AddProperty(isolate, entry, module_string,
import_module.ToHandleChecked(), NONE);
JSObject::AddProperty(isolate, entry, name_string,
import_name.ToHandleChecked(), NONE);
JSObject::AddProperty(isolate, entry, kind_string, import_kind, NONE);
if (!type_value.is_null()) {
JSObject::AddProperty(isolate, entry, type_string, type_value, NONE);
}
storage->set(index, *entry);
}
return array_object;
}
Handle<JSArray> GetExports(Isolate* isolate,
Handle<WasmModuleObject> module_object) {
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(isolate);
Factory* factory = isolate->factory();
Handle<String> name_string = factory->InternalizeUtf8String("name");
Handle<String> kind_string = factory->InternalizeUtf8String("kind");
Handle<String> type_string = factory->InternalizeUtf8String("type");
Handle<String> function_string = factory->InternalizeUtf8String("function");
Handle<String> table_string = factory->InternalizeUtf8String("table");
Handle<String> memory_string = factory->InternalizeUtf8String("memory");
Handle<String> global_string = factory->InternalizeUtf8String("global");
Handle<String> exception_string = factory->InternalizeUtf8String("exception");
// Create the result array.
const WasmModule* module = module_object->module();
int num_exports = static_cast<int>(module->export_table.size());
Handle<JSArray> array_object = factory->NewJSArray(PACKED_ELEMENTS, 0, 0);
Handle<FixedArray> storage = factory->NewFixedArray(num_exports);
JSArray::SetContent(array_object, storage);
array_object->set_length(Smi::FromInt(num_exports));
Handle<JSFunction> object_function =
Handle<JSFunction>(isolate->native_context()->object_function(), isolate);
// Populate the result array.
for (int index = 0; index < num_exports; ++index) {
const WasmExport& exp = module->export_table[index];
Handle<String> export_kind;
Handle<JSObject> type_value;
switch (exp.kind) {
case kExternalFunction:
if (enabled_features.type_reflection) {
auto& func = module->functions[exp.index];
type_value = GetTypeForFunction(isolate, func.sig);
}
export_kind = function_string;
break;
case kExternalTable:
if (enabled_features.type_reflection) {
auto& table = module->tables[exp.index];
base::Optional<uint32_t> maximum_size;
if (table.has_maximum_size) maximum_size.emplace(table.maximum_size);
type_value = GetTypeForTable(isolate, table.type, table.initial_size,
maximum_size);
}
export_kind = table_string;
break;
case kExternalMemory:
if (enabled_features.type_reflection) {
DCHECK_EQ(0, exp.index); // Only one memory supported.
base::Optional<uint32_t> maximum_size;
if (module->has_maximum_pages) {
maximum_size.emplace(module->maximum_pages);
}
type_value =
GetTypeForMemory(isolate, module->initial_pages, maximum_size);
}
export_kind = memory_string;
break;
case kExternalGlobal:
if (enabled_features.type_reflection) {
auto& global = module->globals[exp.index];
type_value =
GetTypeForGlobal(isolate, global.mutability, global.type);
}
export_kind = global_string;
break;
case kExternalException:
export_kind = exception_string;
break;
default:
UNREACHABLE();
}
Handle<JSObject> entry = factory->NewJSObject(object_function);
MaybeHandle<String> export_name =
WasmModuleObject::ExtractUtf8StringFromModuleBytes(
isolate, module_object, exp.name);
JSObject::AddProperty(isolate, entry, name_string,
export_name.ToHandleChecked(), NONE);
JSObject::AddProperty(isolate, entry, kind_string, export_kind, NONE);
if (!type_value.is_null()) {
JSObject::AddProperty(isolate, entry, type_string, type_value, NONE);
}
storage->set(index, *entry);
}
return array_object;
}
Handle<JSArray> GetCustomSections(Isolate* isolate,
Handle<WasmModuleObject> module_object,
Handle<String> name, ErrorThrower* thrower) {
Factory* factory = isolate->factory();
Vector<const uint8_t> wire_bytes =
module_object->native_module()->wire_bytes();
std::vector<CustomSectionOffset> custom_sections =
DecodeCustomSections(wire_bytes.begin(), wire_bytes.end());
std::vector<Handle<Object>> matching_sections;
// Gather matching sections.
for (auto& section : custom_sections) {
MaybeHandle<String> section_name =
WasmModuleObject::ExtractUtf8StringFromModuleBytes(
isolate, module_object, section.name);
if (!name->Equals(*section_name.ToHandleChecked())) continue;
// Make a copy of the payload data in the section.
size_t size = section.payload.length();
void* memory =
size == 0 ? nullptr : isolate->array_buffer_allocator()->Allocate(size);
if (size && !memory) {
thrower->RangeError("out of memory allocating custom section data");
return Handle<JSArray>();
}
Handle<JSArrayBuffer> buffer =
isolate->factory()->NewJSArrayBuffer(SharedFlag::kNotShared);
constexpr bool is_external = false;
JSArrayBuffer::Setup(buffer, isolate, is_external, memory, size);
memcpy(memory, wire_bytes.begin() + section.payload.offset(),
section.payload.length());
matching_sections.push_back(buffer);
}
int num_custom_sections = static_cast<int>(matching_sections.size());
Handle<JSArray> array_object = factory->NewJSArray(PACKED_ELEMENTS, 0, 0);
Handle<FixedArray> storage = factory->NewFixedArray(num_custom_sections);
JSArray::SetContent(array_object, storage);
array_object->set_length(Smi::FromInt(num_custom_sections));
for (int i = 0; i < num_custom_sections; i++) {
storage->set(i, *matching_sections[i]);
}
return array_object;
}
Handle<FixedArray> DecodeLocalNames(Isolate* isolate,
Handle<WasmModuleObject> module_object) {
Vector<const uint8_t> wire_bytes =
module_object->native_module()->wire_bytes();
LocalNames decoded_locals;
DecodeLocalNames(wire_bytes.begin(), wire_bytes.end(), &decoded_locals);
Handle<FixedArray> locals_names =
isolate->factory()->NewFixedArray(decoded_locals.max_function_index + 1);
for (LocalNamesPerFunction& func : decoded_locals.names) {
Handle<FixedArray> func_locals_names =
isolate->factory()->NewFixedArray(func.max_local_index + 1);
locals_names->set(func.function_index, *func_locals_names);
for (LocalName& name : func.names) {
Handle<String> name_str =
WasmModuleObject::ExtractUtf8StringFromModuleBytes(
isolate, module_object, name.name)
.ToHandleChecked();
func_locals_names->set(name.local_index, *name_str);
}
}
return locals_names;
}
namespace {
template <typename T>
inline size_t VectorSize(const std::vector<T>& vector) {
return sizeof(T) * vector.size();
}
} // namespace
size_t EstimateStoredSize(const WasmModule* module) {
return sizeof(WasmModule) + VectorSize(module->globals) +
(module->signature_zone ? module->signature_zone->allocation_size()
: 0) +
VectorSize(module->signatures) + VectorSize(module->signature_ids) +
VectorSize(module->functions) + VectorSize(module->data_segments) +
VectorSize(module->tables) + VectorSize(module->import_table) +
VectorSize(module->export_table) + VectorSize(module->exceptions) +
VectorSize(module->elem_segments);
}
} // namespace wasm
} // namespace internal
} // namespace v8