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LibJS: Remove derivable fields from ExecutionContext

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Remove four fields that are trivially derivable from other fields
already present in the ExecutionContext:

- global_object (from realm)
- global_declarative_environment (from realm)
- identifier_table (from executable)
- property_key_table (from executable)

This shrinks ExecutionContext from 192 to 160 bytes (-17%).

The asmint's GetGlobal/SetGlobal handlers now load through the realm
pointer, taking advantage of the cached declarative environment
pointer added in the previous commit.
This commit is contained in:
Andreas Kling
2026-03-08 11:34:32 +01:00
committed by Andreas Kling
parent e70f580e5c
commit 96d02d5249
Notes: github-actions[bot] 2026-03-11 12:35:42 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/96d02d5249d
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8360
Reviewed-by: https://github.com/shannonbooth
6 changed files with 24 additions and 28 deletions
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18
Libraries/LibJS/Bytecode/Interpreter.cpp
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@@ -316,11 +316,6 @@ ExecutionContext* Interpreter::push_inline_frame(
// and global_declarative_environment, since the caller's realm may differ
// in cross-realm calls (e.g. iframe <-> parent).
callee_context->executable = callee_executable;
auto& callee_realm = *callee_context->realm;
callee_context->global_object = callee_realm.global_object();
callee_context->global_declarative_environment = callee_realm.global_environment().declarative_record();
callee_context->identifier_table = callee_executable.identifier_table->identifiers().data();
callee_context->property_key_table = callee_executable.property_key_table->property_keys().data();
// Copy constants (memcpy avoids aliasing issues with the scalar loop).
auto* values = callee_context->registers_and_constants_and_locals_and_arguments();
@@ -808,12 +803,17 @@ void Interpreter::run_bytecode(size_t entry_point)
Utf16FlyString const& Interpreter::get_identifier(IdentifierTableIndex index) const
{
return m_running_execution_context->identifier_table[index.value];
return m_running_execution_context->executable->get_identifier(index);
}
PropertyKey const& Interpreter::get_property_key(PropertyKeyTableIndex index) const
{
return m_running_execution_context->property_key_table[index.value];
return m_running_execution_context->executable->get_property_key(index);
}
DeclarativeEnvironment& Interpreter::global_declarative_environment()
{
return realm().global_declarative_environment();
}
ThrowCompletionOr<Value> Interpreter::run_executable(ExecutionContext& context, Executable& executable, Optional<size_t> entry_point)
@@ -824,10 +824,6 @@ ThrowCompletionOr<Value> Interpreter::run_executable(ExecutionContext& context,
TemporaryChange restore_running_execution_context { m_running_execution_context, &context };
context.executable = executable;
context.global_object = realm().global_object();
context.global_declarative_environment = realm().global_environment().declarative_record();
context.identifier_table = executable.identifier_table->identifiers().data();
context.property_key_table = executable.property_key_table->property_keys().data();
VERIFY(executable.registers_and_locals_count + executable.constants.size() == executable.registers_and_locals_and_constants_count);
VERIFY(executable.registers_and_locals_and_constants_count <= context.registers_and_constants_and_locals_and_arguments_span().size());