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LibJS: Put Bytecode::CallFrame + register slots in a single allocation

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The number of registers in a call frame never changes, so we can
allocate it at the end of the CallFrame object and save ourselves the
cost of allocating separate Vector storage for every call frame.
This commit is contained in:
Andreas Kling 2023-11-27 17:27:51 +01:00
parent 3dc5f467a8
commit 3fc0333ee6
11 changed files with 57 additions and 36 deletions
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27
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@ -40,6 +40,18 @@ namespace JS::Bytecode {
bool g_dump_bytecode = false;
NonnullOwnPtr<CallFrame> CallFrame::create(size_t register_count)
{
size_t allocation_size = sizeof(CallFrame) + sizeof(Value) * register_count;
auto* memory = malloc(allocation_size);
VERIFY(memory);
auto call_frame = adopt_own(*new (memory) CallFrame);
call_frame->register_count = register_count;
for (auto i = 0u; i < register_count; ++i)
new (&call_frame->register_values[i]) Value();
return call_frame;
}
Interpreter::Interpreter(VM& vm)
: m_vm(vm)
{
@ -125,7 +137,7 @@ ThrowCompletionOr<Value> Interpreter::run(Script& script_record, JS::GCPtr<Envir
if (result_or_error.value.is_error())
result = result_or_error.value.release_error();
else
result = result_or_error.frame->registers[0];
result = result_or_error.frame->registers()[0];
}
}
@ -354,9 +366,9 @@ Interpreter::ValueAndFrame Interpreter::run_and_return_frame(Executable& executa
TemporaryChange restore_current_block { m_current_block, entry_point ?: executable.basic_blocks.first() };
if (in_frame)
push_call_frame(in_frame, executable.number_of_registers);
push_call_frame(in_frame);
else
push_call_frame(make<CallFrame>(), executable.number_of_registers);
push_call_frame(CallFrame::create(executable.number_of_registers));
vm().execution_context_stack().last()->executable = &executable;
@ -400,7 +412,7 @@ Interpreter::ValueAndFrame Interpreter::run_and_return_frame(Executable& executa
// NOTE: The return value from a called function is put into $0 in the caller context.
if (!m_call_frames.is_empty())
call_frame().registers[0] = return_value;
call_frame().registers()[0] = return_value;
// At this point we may have already run any queued promise jobs via on_call_stack_emptied,
// in which case this is a no-op.
@ -471,18 +483,17 @@ Realm& Interpreter::realm()
return *m_vm.current_realm();
}
void Interpreter::push_call_frame(Variant<NonnullOwnPtr<CallFrame>, CallFrame*> frame, size_t register_count)
void Interpreter::push_call_frame(Variant<NonnullOwnPtr<CallFrame>, CallFrame*> frame)
{
m_call_frames.append(move(frame));
this->call_frame().registers.resize(register_count);
m_current_call_frame = this->call_frame().registers;
m_current_call_frame = this->call_frame().registers();
reg(Register::return_value()) = {};
}
Variant<NonnullOwnPtr<CallFrame>, CallFrame*> Interpreter::pop_call_frame()
{
auto frame = m_call_frames.take_last();
m_current_call_frame = m_call_frames.is_empty() ? Span<Value> {} : this->call_frame().registers;
m_current_call_frame = m_call_frames.is_empty() ? Span<Value> {} : this->call_frame().registers();
return frame;
}