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LibJS/JIT: Add GetGlobal fast path

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iliadsh 2023-11-13 01:45:46 +00:00 committed by Andreas Kling
parent ddea710933
commit 671cbf6a5b
Notes: sideshowbarker 2024-07-17 08:45:34 +09:00 
Author: https://github.com/iliadsh
Commit: https://github.com/SerenityOS/serenity/commit/671cbf6a5b
Pull-request: https://github.com/SerenityOS/serenity/pull/21919
1 changed files with 140 additions and 1 deletions
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141
Userland/Libraries/LibJS/JIT/Compiler.cpp
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@ -17,6 +17,8 @@
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
#include <LibJS/Runtime/FunctionEnvironment.h>
#include <LibJS/Runtime/GlobalEnvironment.h>
#include <LibJS/Runtime/ObjectEnvironment.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <sys/mman.h>
@ -1533,15 +1535,152 @@ static Value cxx_get_global(VM& vm, DeprecatedFlyString const& identifier, Bytec
void Compiler::compile_get_global(Bytecode::Op::GetGlobal const& op)
{
auto& cache = m_bytecode_executable.global_variable_caches[op.cache_index()];
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.identifier()))));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.global_variable_caches[op.cache_index()])));
Assembler::Operand::Imm(bit_cast<u64>(&cache)));
Assembler::Label end {};
Assembler::Label slow_case {};
// GPR0 = vm.running_execution_context().realm;
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(RUNNING_EXECUTION_CONTEXT_BASE, ExecutionContext::realm_offset()));
// GPR0 = GPR0->global_environment();
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(GPR0, Realm::global_environment_offset()));
// GPR1 = GPR0->object_record();
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Mem64BaseAndOffset(GPR0, GlobalEnvironment::object_record_offset()));
// GPR1 = GPR1->binding_object();
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Mem64BaseAndOffset(GPR1, ObjectEnvironment::binding_object_offset()));
// GPR0 = GPR0->declarative_record();
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(GPR0, GlobalEnvironment::declarative_record_offset()));
// GPR0 = GPR0->environment_serial_number();
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(GPR0, DeclarativeEnvironment::environment_serial_number_offset()));
// GPR2 = cache.environment_serial_number
m_assembler.mov(
Assembler::Operand::Register(GPR2),
Assembler::Operand::Mem64BaseAndOffset(ARG2, Bytecode::GlobalVariableCache::environment_serial_number_offset()));
// if (GPR2 != GPR0) goto slow_case;
m_assembler.jump_if(
Assembler::Operand::Register(GPR2),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Register(GPR0),
slow_case);
// GPR0 = GPR1->shape()
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(GPR1, Object::shape_offset()));
// GPR2 = cache.shape.ptr()
m_assembler.mov(
Assembler::Operand::Register(GPR2),
Assembler::Operand::Mem64BaseAndOffset(ARG2, Bytecode::PropertyLookupCache::shape_offset()));
m_assembler.jump_if(
Assembler::Operand::Register(GPR2),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
slow_case);
m_assembler.mov(
Assembler::Operand::Register(GPR2),
Assembler::Operand::Mem64BaseAndOffset(GPR2, AK::WeakLink::ptr_offset()));
// if (GPR2 != GPR0) goto slow_case;
m_assembler.jump_if(
Assembler::Operand::Register(GPR2),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Register(GPR0),
slow_case);
Assembler::Label fast_case {};
// GPR2 = shape->unique()
m_assembler.mov8(
Assembler::Operand::Register(GPR2),
Assembler::Operand::Mem64BaseAndOffset(GPR0, Shape::is_unique_offset()));
// if (!GPR2) goto fast_case;
m_assembler.jump_if(
Assembler::Operand::Register(GPR2),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
fast_case);
// GPR2 = shape->unique_shape_serial_number()
m_assembler.mov(
Assembler::Operand::Register(GPR2),
Assembler::Operand::Mem64BaseAndOffset(GPR0, Shape::unique_shape_serial_number_offset()));
// GPR0 = cache.unique_shape_serial_number
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(ARG2, Bytecode::PropertyLookupCache::unique_shape_serial_number_offset()));
// if (GPR2 != GPR0) goto slow_case;
m_assembler.jump_if(
Assembler::Operand::Register(GPR2),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Register(GPR0),
slow_case);
fast_case.link(m_assembler);
// accumulator = GPR1->get_direct(*cache.property_offset);
// GPR0 = GPR1
// GPR1 = *cache.property_offset * sizeof(Value)
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(GPR1));
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Mem64BaseAndOffset(ARG2, Bytecode::PropertyLookupCache::property_offset_offset() + decltype(cache.property_offset)::value_offset()));
m_assembler.mul32(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(sizeof(Value)),
slow_case);
// GPR0 = GPR0->m_storage.outline_buffer
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(GPR0, Object::storage_offset() + Vector<Value>::outline_buffer_offset()));
// GPR0 = &GPR0[*cache.property_offset]
m_assembler.add(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(GPR1));
// accumulator = *GPR0
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(GPR0, 0));
store_accumulator(GPR0);
m_assembler.jump(end);
slow_case.link(m_assembler);
native_call((void*)cxx_get_global);
store_accumulator(RET);
check_exception();
end.link(m_assembler);
}
static Value cxx_get_variable(VM& vm, DeprecatedFlyString const& name, Bytecode::EnvironmentVariableCache& cache)