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LibJS/Bytecode: Move environment coordinate caches to Executable

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Moving them out of the respective instructions allows the bytecode
stream to be immutable.
This commit is contained in:
Andreas Kling 2023-10-26 10:39:40 +02:00
parent 5c7e5cc738
commit 2e23f00a2f
Notes: sideshowbarker 2024-07-17 02:14:39 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/2e23f00a2f
7 changed files with 31 additions and 20 deletions
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6
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
View file

@ -314,7 +314,7 @@ Bytecode::CodeGenerationErrorOr<void> Identifier::generate_bytecode(Bytecode::Ge
} else if (is_local()) {
generator.emit<Bytecode::Op::GetLocal>(local_variable_index());
} else {
generator.emit<Bytecode::Op::GetVariable>(generator.intern_identifier(m_string));
generator.emit<Bytecode::Op::GetVariable>(generator.intern_identifier(m_string), generator.next_environment_variable_cache());
}
return {};
}
@ -1061,7 +1061,7 @@ Bytecode::CodeGenerationErrorOr<void> FunctionDeclaration::generate_bytecode(Byt
if (m_is_hoisted) {
Bytecode::Generator::SourceLocationScope scope(generator, *this);
auto index = generator.intern_identifier(name());
generator.emit<Bytecode::Op::GetVariable>(index);
generator.emit<Bytecode::Op::GetVariable>(index, generator.next_environment_variable_cache());
generator.emit<Bytecode::Op::SetVariable>(index, Bytecode::Op::SetVariable::InitializationMode::Set, Bytecode::Op::EnvironmentMode::Var);
}
return {};
@ -1534,7 +1534,7 @@ Bytecode::CodeGenerationErrorOr<void> CallExpression::generate_bytecode(Bytecode
// a `with` binding, so we can skip this.
auto& identifier = static_cast<Identifier const&>(*m_callee);
if (!identifier.is_local() && !identifier.is_global()) {
generator.emit<Bytecode::Op::GetCalleeAndThisFromEnvironment>(generator.intern_identifier(identifier.string()), callee_reg, this_reg);
generator.emit<Bytecode::Op::GetCalleeAndThisFromEnvironment>(generator.intern_identifier(identifier.string()), callee_reg, this_reg, generator.next_environment_variable_cache());
} else {
TRY(m_callee->generate_bytecode(generator));
generator.emit<Bytecode::Op::Store>(callee_reg);

2
Userland/Libraries/LibJS/Bytecode/Executable.cpp
View file

@ -18,6 +18,7 @@ Executable::Executable(
NonnullRefPtr<SourceCode const> source_code,
size_t number_of_property_lookup_caches,
size_t number_of_global_variable_caches,
size_t number_of_environment_variable_caches,
size_t number_of_registers,
Vector<NonnullOwnPtr<BasicBlock>> basic_blocks,
bool is_strict_mode)
@ -31,6 +32,7 @@ Executable::Executable(
{
property_lookup_caches.resize(number_of_property_lookup_caches);
global_variable_caches.resize(number_of_global_variable_caches);
environment_variable_caches.resize(number_of_environment_variable_caches);
}
Executable::~Executable() = default;

3
Userland/Libraries/LibJS/Bytecode/Executable.h
View file

@ -12,6 +12,7 @@
#include <LibJS/Bytecode/IdentifierTable.h>
#include <LibJS/Bytecode/StringTable.h>
#include <LibJS/Forward.h>
#include <LibJS/Runtime/EnvironmentCoordinate.h>
namespace JS::Bytecode {
@ -39,6 +40,7 @@ public:
NonnullRefPtr<SourceCode const>,
size_t number_of_property_lookup_caches,
size_t number_of_global_variable_caches,
size_t number_of_environment_variable_caches,
size_t number_of_registers,
Vector<NonnullOwnPtr<BasicBlock>>,
bool is_strict_mode);
@ -48,6 +50,7 @@ public:
DeprecatedFlyString name;
Vector<PropertyLookupCache> property_lookup_caches;
Vector<GlobalVariableCache> global_variable_caches;
Vector<Optional<EnvironmentCoordinate>> environment_variable_caches;
Vector<NonnullOwnPtr<BasicBlock>> basic_blocks;
NonnullOwnPtr<StringTable> string_table;
NonnullOwnPtr<IdentifierTable> identifier_table;

1
Userland/Libraries/LibJS/Bytecode/Generator.cpp
View file

@ -63,6 +63,7 @@ CodeGenerationErrorOr<NonnullRefPtr<Executable>> Generator::generate(ASTNode con
node.source_code(),
generator.m_next_property_lookup_cache,
generator.m_next_global_variable_cache,
generator.m_next_environment_variable_cache,
generator.m_next_register,
move(generator.m_root_basic_blocks),
is_strict_mode));

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

@ -206,6 +206,7 @@ public:
void emit_get_by_id_with_this(IdentifierTableIndex, Register);
[[nodiscard]] size_t next_global_variable_cache() { return m_next_global_variable_cache++; }
[[nodiscard]] size_t next_environment_variable_cache() { return m_next_environment_variable_cache++; }
private:
enum class JumpType {
@ -236,6 +237,7 @@ private:
u32 m_next_block { 1 };
u32 m_next_property_lookup_cache { 0 };
u32 m_next_global_variable_cache { 0 };
u32 m_next_environment_variable_cache { 0 };
FunctionKind m_enclosing_function_kind { FunctionKind::Normal };
Vector<LabelableScope> m_continuable_scopes;
Vector<LabelableScope> m_breakable_scopes;

22
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -812,23 +812,24 @@ ThrowCompletionOr<void> GetVariable::execute_impl(Bytecode::Interpreter& interpr
{
auto& vm = interpreter.vm();
if (m_cached_environment_coordinate.has_value()) {
auto& cached_environment_coordinate = interpreter.current_executable().environment_variable_caches[m_cache_index];
if (cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < m_cached_environment_coordinate->hops; ++i)
for (size_t i = 0; i < cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
interpreter.accumulator() = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, m_cached_environment_coordinate.value().index, vm.in_strict_mode()));
interpreter.accumulator() = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, cached_environment_coordinate.value().index, vm.in_strict_mode()));
return {};
}
m_cached_environment_coordinate = {};
cached_environment_coordinate = {};
}
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
m_cached_environment_coordinate = reference.environment_coordinate();
cached_environment_coordinate = reference.environment_coordinate();
interpreter.accumulator() = TRY(reference.get_value(vm));
return {};
}
@ -837,27 +838,28 @@ ThrowCompletionOr<void> GetCalleeAndThisFromEnvironment::execute_impl(Bytecode::
{
auto& vm = interpreter.vm();
if (m_cached_environment_coordinate.has_value()) {
auto& cached_environment_coordinate = interpreter.current_executable().environment_variable_caches[m_cache_index];
if (cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < m_cached_environment_coordinate->hops; ++i)
for (size_t i = 0; i < cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
interpreter.reg(m_callee_reg) = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, m_cached_environment_coordinate.value().index, vm.in_strict_mode()));
interpreter.reg(m_callee_reg) = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, cached_environment_coordinate.value().index, vm.in_strict_mode()));
Value this_value = js_undefined();
if (auto base_object = environment->with_base_object())
this_value = base_object;
interpreter.reg(m_this_reg) = this_value;
return {};
}
m_cached_environment_coordinate = {};
cached_environment_coordinate = {};
}
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
m_cached_environment_coordinate = reference.environment_coordinate();
cached_environment_coordinate = reference.environment_coordinate();
interpreter.reg(m_callee_reg) = TRY(reference.get_value(vm));

15
Userland/Libraries/LibJS/Bytecode/Op.h
View file

@ -18,7 +18,6 @@
#include <LibJS/Bytecode/StringTable.h>
#include <LibJS/Heap/Cell.h>
#include <LibJS/Runtime/Environment.h>
#include <LibJS/Runtime/EnvironmentCoordinate.h>
#include <LibJS/Runtime/Iterator.h>
#include <LibJS/Runtime/Value.h>
#include <LibJS/Runtime/ValueTraits.h>
@ -451,11 +450,12 @@ private:
class GetCalleeAndThisFromEnvironment final : public Instruction {
public:
explicit GetCalleeAndThisFromEnvironment(IdentifierTableIndex identifier, Register callee_reg, Register this_reg)
explicit GetCalleeAndThisFromEnvironment(IdentifierTableIndex identifier, Register callee_reg, Register this_reg, u32 cache_index)
: Instruction(Type::GetCalleeAndThisFromEnvironment, sizeof(*this))
, m_identifier(identifier)
, m_callee_reg(callee_reg)
, m_this_reg(this_reg)
, m_cache_index(cache_index)
{
}
@ -463,20 +463,21 @@ public:
DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
IdentifierTableIndex identifier() const { return m_identifier; }
u32 cache_index() const { return m_cache_index; }
private:
IdentifierTableIndex m_identifier;
Register m_callee_reg;
Register m_this_reg;
Optional<EnvironmentCoordinate> mutable m_cached_environment_coordinate;
u32 m_cache_index { 0 };
};
class GetVariable final : public Instruction {
public:
explicit GetVariable(IdentifierTableIndex identifier)
explicit GetVariable(IdentifierTableIndex identifier, u32 cache_index)
: Instruction(Type::GetVariable, sizeof(*this))
, m_identifier(identifier)
, m_cache_index(cache_index)
{
}
@ -484,11 +485,11 @@ public:
DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
IdentifierTableIndex identifier() const { return m_identifier; }
u32 cache_index() const { return m_cache_index; }
private:
IdentifierTableIndex m_identifier;
Optional<EnvironmentCoordinate> mutable m_cached_environment_coordinate;
u32 m_cache_index { 0 };
};
class GetGlobal final : public Instruction {