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LibJS/Bytecode: Don't bother propagating completion values in functions

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The last completion value in a function is not exposed to the language,
since functions always either return something, or undefined.

Given this, we can avoid emitting code that propagates the completion
value from various statements, as long as we know we're generating code
for a context where the completion value is not accessible. In practical
terms, this means that function code gets to do less completion
shuffling, while global and eval code has to keep doing it.
This commit is contained in:
Andreas Kling
2024-05-14 10:57:06 +02:00
parent 6c5e09557d
commit 9265385807
Notes: sideshowbarker 2024-07-17 06:51:48 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/9265385807
Pull-request: https://github.com/SerenityOS/serenity/pull/24324
3 changed files with 89 additions and 47 deletions
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9
Userland/Libraries/LibJS/Bytecode/Generator.cpp
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@@ -17,13 +17,14 @@
namespace JS::Bytecode {
Generator::Generator(VM& vm)
Generator::Generator(VM& vm, MustPropagateCompletion must_propagate_completion)
: m_vm(vm)
, m_string_table(make<StringTable>())
, m_identifier_table(make<IdentifierTable>())
, m_regex_table(make<RegexTable>())
, m_constants(vm.heap())
, m_accumulator(*this, Operand(Register::accumulator()))
, m_must_propagate_completion(must_propagate_completion == MustPropagateCompletion::Yes)
{
}
@@ -190,9 +191,9 @@ CodeGenerationErrorOr<void> Generator::emit_function_declaration_instantiation(E
return {};
}
CodeGenerationErrorOr<NonnullGCPtr<Executable>> Generator::emit_function_body_bytecode(VM& vm, ASTNode const& node, FunctionKind enclosing_function_kind, GCPtr<ECMAScriptFunctionObject const> function)
CodeGenerationErrorOr<NonnullGCPtr<Executable>> Generator::emit_function_body_bytecode(VM& vm, ASTNode const& node, FunctionKind enclosing_function_kind, GCPtr<ECMAScriptFunctionObject const> function, MustPropagateCompletion must_propagate_completion)
{
Generator generator(vm);
Generator generator(vm, must_propagate_completion);
generator.switch_to_basic_block(generator.make_block());
SourceLocationScope scope(generator, node);
@@ -429,7 +430,7 @@ CodeGenerationErrorOr<NonnullGCPtr<Executable>> Generator::generate_from_ast_nod
CodeGenerationErrorOr<NonnullGCPtr<Executable>> Generator::generate_from_function(VM& vm, ECMAScriptFunctionObject const& function)
{
return emit_function_body_bytecode(vm, function.ecmascript_code(), function.kind(), &function);
return emit_function_body_bytecode(vm, function.ecmascript_code(), function.kind(), &function, MustPropagateCompletion::No);
}
void Generator::grow(size_t additional_size)