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LibJS/JIT: Resolve the EnvironmentVariableCache pointers at JIT time

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This commit is contained in:
Andreas Kling 2023-11-05 15:14:54 +01:00
parent a616a682fe
commit 536b9c29e4
5 changed files with 17 additions and 13 deletions
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13
Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp
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@ -308,26 +308,25 @@ ThrowCompletionOr<void> put_by_value(VM& vm, Value base, Value property_key_valu
return {};
}
ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter& interpreter, DeprecatedFlyString const& name, u32 cache_index)
ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter& interpreter, DeprecatedFlyString const& name, EnvironmentVariableCache& cache)
{
auto& vm = interpreter.vm();
auto& cached_environment_coordinate = interpreter.current_executable().environment_variable_caches[cache_index];
if (cached_environment_coordinate.has_value()) {
if (cache.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < cached_environment_coordinate->hops; ++i)
for (size_t i = 0; i < cache->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
return TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, cached_environment_coordinate.value().index, vm.in_strict_mode()));
return TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, cache.value().index, vm.in_strict_mode()));
}
cached_environment_coordinate = {};
cache = {};
}
auto reference = TRY(vm.resolve_binding(name));
if (reference.environment_coordinate().has_value())
cached_environment_coordinate = reference.environment_coordinate();
cache = reference.environment_coordinate();
return TRY(reference.get_value(vm));
}

2
Userland/Libraries/LibJS/Bytecode/CommonImplementations.h
View file

@ -23,7 +23,7 @@ ThrowCompletionOr<Value> typeof_variable(VM&, DeprecatedFlyString const&);
ThrowCompletionOr<void> set_variable(VM&, DeprecatedFlyString const&, Value, Op::EnvironmentMode, Op::SetVariable::InitializationMode);
Value new_function(VM&, FunctionExpression const&, Optional<IdentifierTableIndex> const& lhs_name, Optional<Register> const& home_object);
ThrowCompletionOr<void> put_by_value(VM&, Value base, Value property_key_value, Value value, Op::PropertyKind);
ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter&, DeprecatedFlyString const& name, u32 cache_index);
ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter&, DeprecatedFlyString const& name, EnvironmentVariableCache&);
struct CalleeAndThis {
Value callee;

4
Userland/Libraries/LibJS/Bytecode/Executable.h
View file

@ -33,6 +33,8 @@ struct GlobalVariableCache : public PropertyLookupCache {
u64 environment_serial_number { 0 };
};
using EnvironmentVariableCache = Optional<EnvironmentCoordinate>;
struct SourceRecord {
u32 source_start_offset {};
u32 source_end_offset {};
@ -57,7 +59,7 @@ public:
DeprecatedFlyString name;
Vector<PropertyLookupCache> property_lookup_caches;
Vector<GlobalVariableCache> global_variable_caches;
Vector<Optional<EnvironmentCoordinate>> environment_variable_caches;
Vector<EnvironmentVariableCache> environment_variable_caches;
Vector<NonnullOwnPtr<BasicBlock>> basic_blocks;
NonnullOwnPtr<StringTable> string_table;
NonnullOwnPtr<IdentifierTable> identifier_table;

5
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -683,7 +683,10 @@ ThrowCompletionOr<void> ConcatString::execute_impl(Bytecode::Interpreter& interp
ThrowCompletionOr<void> GetVariable::execute_impl(Bytecode::Interpreter& interpreter) const
{
interpreter.accumulator() = TRY(get_variable(interpreter, interpreter.current_executable().get_identifier(m_identifier), m_cache_index));
interpreter.accumulator() = TRY(get_variable(
interpreter,
interpreter.current_executable().get_identifier(m_identifier),
interpreter.current_executable().environment_variable_caches[m_cache_index]));
return {};
}