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serenity/Userland/Libraries/LibJS/JIT/Compiler.cpp
Simon Wanner ac43d3f6db LibJS/JIT: Compile the PutPrivateById instruction
2023-10-29 22:57:19 +01:00

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/*
* Copyright (c) 2023, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2023, Simon Wanner <simon@skyrising.xyz>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/OwnPtr.h>
#include <AK/Platform.h>
#include <LibJS/Bytecode/CommonImplementations.h>
#include <LibJS/Bytecode/Instruction.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Bytecode/RegexTable.h>
#include <LibJS/JIT/Compiler.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
#include <LibJS/Runtime/FunctionEnvironment.h>
#include <LibJS/Runtime/VM.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <sys/mman.h>
#include <unistd.h>
#if ARCH(X86_64)
# define LOG_JIT_SUCCESS 1
# define LOG_JIT_FAILURE 1
# define DUMP_JIT_MACHINE_CODE_TO_STDOUT 0
# define DUMP_JIT_DISASSEMBLY 0
# define TRY_OR_SET_EXCEPTION(expression) \
({ \
/* Ignore -Wshadow to allow nesting the macro. */ \
AK_IGNORE_DIAGNOSTIC("-Wshadow", \
auto&& _temporary_result = (expression)); \
static_assert(!::AK::Detail::IsLvalueReference<decltype(_temporary_result.release_value())>, \
"Do not return a reference from a fallible expression"); \
if (_temporary_result.is_error()) [[unlikely]] { \
vm.bytecode_interpreter().reg(Bytecode::Register::exception()) = _temporary_result.release_error().value().value(); \
return {}; \
} \
_temporary_result.release_value(); \
})
namespace JS::JIT {
void Compiler::store_vm_register(Bytecode::Register dst, Assembler::Reg src)
{
m_assembler.mov(
Assembler::Operand::Mem64BaseAndOffset(REGISTER_ARRAY_BASE, dst.index() * sizeof(Value)),
Assembler::Operand::Register(src));
}
void Compiler::load_vm_register(Assembler::Reg dst, Bytecode::Register src)
{
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Mem64BaseAndOffset(REGISTER_ARRAY_BASE, src.index() * sizeof(Value)));
}
void Compiler::store_vm_local(size_t dst, Assembler::Reg src)
{
m_assembler.mov(
Assembler::Operand::Mem64BaseAndOffset(LOCALS_ARRAY_BASE, dst * sizeof(Value)),
Assembler::Operand::Register(src));
}
void Compiler::load_vm_local(Assembler::Reg dst, size_t src)
{
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Mem64BaseAndOffset(LOCALS_ARRAY_BASE, src * sizeof(Value)));
}
void Compiler::compile_load_immediate(Bytecode::Op::LoadImmediate const& op)
{
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(op.value().encoded()));
store_vm_register(Bytecode::Register::accumulator(), GPR0);
}
void Compiler::compile_load(Bytecode::Op::Load const& op)
{
load_vm_register(GPR0, op.src());
store_vm_register(Bytecode::Register::accumulator(), GPR0);
}
void Compiler::compile_store(Bytecode::Op::Store const& op)
{
load_vm_register(GPR0, Bytecode::Register::accumulator());
store_vm_register(op.dst(), GPR0);
}
void Compiler::compile_get_local(Bytecode::Op::GetLocal const& op)
{
load_vm_local(GPR0, op.index());
store_vm_register(Bytecode::Register::accumulator(), GPR0);
}
void Compiler::compile_set_local(Bytecode::Op::SetLocal const& op)
{
load_vm_register(GPR0, Bytecode::Register::accumulator());
store_vm_local(op.index(), GPR0);
}
static Value cxx_typeof_local(VM& vm, Value value)
{
return PrimitiveString::create(vm, value.typeof());
}
void Compiler::compile_typeof_local(Bytecode::Op::TypeofLocal const& op)
{
load_vm_local(ARG1, op.index());
native_call((void*)cxx_typeof_local);
store_vm_register(Bytecode::Register::accumulator(), GPR0);
}
void Compiler::compile_jump(Bytecode::Op::Jump const& op)
{
m_assembler.jump(label_for(op.true_target()->block()));
}
static bool cxx_to_boolean(VM&, Value value)
{
return value.to_boolean();
}
void Compiler::compile_to_boolean(Assembler::Reg dst, Assembler::Reg src)
{
// dst = src;
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Register(src));
// dst >>= 48;
m_assembler.shift_right(
Assembler::Operand::Register(dst),
Assembler::Operand::Imm(48));
// if (dst != BOOLEAN_TAG) goto slow_case;
Assembler::Label slow_case {};
m_assembler.jump_if(
Assembler::Operand::Register(dst),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Imm(BOOLEAN_TAG),
slow_case);
// Fast path for JS::Value booleans.
// dst = src;
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Register(src));
// goto end;
auto end = m_assembler.jump();
// slow_case: // call C++ helper
slow_case.link(m_assembler);
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Register(src));
native_call((void*)cxx_to_boolean);
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Register(RET));
// end:
end.link(m_assembler);
// dst &= 1;
m_assembler.bitwise_and(
Assembler::Operand::Register(dst),
Assembler::Operand::Imm(1));
}
void Compiler::compile_jump_conditional(Bytecode::Op::JumpConditional const& op)
{
load_vm_register(GPR1, Bytecode::Register::accumulator());
compile_to_boolean(GPR0, GPR1);
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
label_for(op.false_target()->block()));
m_assembler.jump(label_for(op.true_target()->block()));
}
void Compiler::compile_jump_nullish(Bytecode::Op::JumpNullish const& op)
{
load_vm_register(GPR0, Bytecode::Register::accumulator());
m_assembler.shift_right(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(48));
m_assembler.bitwise_and(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(IS_NULLISH_EXTRACT_PATTERN));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(IS_NULLISH_PATTERN),
label_for(op.true_target()->block()));
m_assembler.jump(label_for(op.false_target()->block()));
}
[[maybe_unused]] static Value cxx_increment(VM& vm, Value value)
{
auto old_value = TRY_OR_SET_EXCEPTION(value.to_numeric(vm));
if (old_value.is_number())
return Value(old_value.as_double() + 1);
return BigInt::create(vm, old_value.as_bigint().big_integer().plus(Crypto::SignedBigInteger { 1 }));
}
template<typename Codegen>
void Compiler::branch_if_int32(Assembler::Reg reg, Codegen codegen)
{
// GPR0 = reg >> 48;
m_assembler.mov(Assembler::Operand::Register(GPR0), Assembler::Operand::Register(reg));
m_assembler.shift_right(Assembler::Operand::Register(GPR0), Assembler::Operand::Imm(48));
Assembler::Label not_int32_case {};
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Imm(INT32_TAG),
not_int32_case);
codegen();
not_int32_case.link(m_assembler);
}
template<typename Codegen>
void Compiler::branch_if_both_int32(Assembler::Reg lhs, Assembler::Reg rhs, Codegen codegen)
{
// GPR0 = lhs >> 48;
m_assembler.mov(Assembler::Operand::Register(GPR0), Assembler::Operand::Register(lhs));
m_assembler.shift_right(Assembler::Operand::Register(GPR0), Assembler::Operand::Imm(48));
// GPR1 = rhs >> 48;
m_assembler.mov(Assembler::Operand::Register(GPR1), Assembler::Operand::Register(rhs));
m_assembler.shift_right(Assembler::Operand::Register(GPR1), Assembler::Operand::Imm(48));
Assembler::Label not_int32_case {};
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Imm(INT32_TAG),
not_int32_case);
m_assembler.jump_if(
Assembler::Operand::Register(GPR1),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Imm(INT32_TAG),
not_int32_case);
codegen();
not_int32_case.link(m_assembler);
}
void Compiler::compile_increment(Bytecode::Op::Increment const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
Assembler::Label end {};
Assembler::Label slow_case {};
branch_if_int32(ARG1, [&] {
// GPR0 = ARG1 & 0xffffffff;
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(ARG1));
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(0xffffffff));
m_assembler.bitwise_and(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(GPR1));
// if (GPR0 == 0x7fffffff) goto slow_case;
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0x7fffffff),
slow_case);
// ARG1 += 1;
m_assembler.add(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(1));
// accumulator = ARG1;
store_vm_register(Bytecode::Register::accumulator(), ARG1);
m_assembler.jump(end);
});
slow_case.link(m_assembler);
native_call((void*)cxx_increment);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
end.link(m_assembler);
}
static Value cxx_decrement(VM& vm, Value value)
{
auto old_value = TRY_OR_SET_EXCEPTION(value.to_numeric(vm));
if (old_value.is_number())
return Value(old_value.as_double() - 1);
return BigInt::create(vm, old_value.as_bigint().big_integer().minus(Crypto::SignedBigInteger { 1 }));
}
void Compiler::compile_decrement(Bytecode::Op::Decrement const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_decrement);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
void Compiler::check_exception()
{
// if (!exception.is_empty()) goto m_exception_handler;
load_vm_register(GPR0, Bytecode::Register::exception());
m_assembler.mov(Assembler::Operand::Register(GPR1), Assembler::Operand::Imm(Value().encoded()));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Register(GPR1),
m_exception_handler);
}
void Compiler::handle_exception()
{
// if (!unwind_context.valid) return;
Assembler::Label handle_exception {};
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(UNWIND_CONTEXT_BASE, 0));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Imm(0),
handle_exception);
jump_to_exit();
// handle_exception:
handle_exception.link(m_assembler);
// if (unwind_context.handler) {
Assembler::Label no_handler {};
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(UNWIND_CONTEXT_BASE, 8));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
no_handler);
// accumulator = exception;
load_vm_register(GPR1, Bytecode::Register::exception());
store_vm_register(Bytecode::Register::accumulator(), GPR1);
// exception = Value();
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(Value().encoded()));
store_vm_register(Bytecode::Register::exception(), GPR1);
// unwind_context.handler = nullptr;
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(0));
m_assembler.mov(
Assembler::Operand::Mem64BaseAndOffset(UNWIND_CONTEXT_BASE, 8),
Assembler::Operand::Register(GPR1));
// goto handler;
m_assembler.jump(Assembler::Operand::Register(GPR0));
// }
// no_handler:
no_handler.link(m_assembler);
// if (unwind_context.finalizer) goto finalizer;
Assembler::Label no_finalizer {};
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Mem64BaseAndOffset(UNWIND_CONTEXT_BASE, 16));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
no_finalizer);
m_assembler.jump(Assembler::Operand::Register(GPR0));
// no_finalizer:
// NOTE: No catch and no finally!? Crash.
no_finalizer.link(m_assembler);
m_assembler.verify_not_reached();
}
void Compiler::push_unwind_context(bool valid, Optional<Bytecode::Label> const& handler, Optional<Bytecode::Label> const& finalizer)
{
// Put this on the stack, and then point UNWIND_CONTEXT_BASE at it.
// struct {
// u64 valid;
// u64 handler;
// u64 finalizer;
// };
if (finalizer.has_value()) {
// push finalizer (patched later)
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(0),
Assembler::Patchable::Yes);
block_data_for(finalizer.value().block()).absolute_references_to_here.append(m_assembler.m_output.size() - 8);
m_assembler.push(Assembler::Operand::Register(GPR0));
} else {
m_assembler.push(Assembler::Operand::Imm(0));
}
if (handler.has_value()) {
// push handler (patched later)
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(0),
Assembler::Patchable::Yes);
block_data_for(handler.value().block()).absolute_references_to_here.append(m_assembler.m_output.size() - 8);
m_assembler.push(Assembler::Operand::Register(GPR0));
} else {
m_assembler.push(Assembler::Operand::Imm(0));
}
// push valid
m_assembler.push(Assembler::Operand::Imm(valid));
// UNWIND_CONTEXT_BASE = STACK_POINTER
m_assembler.mov(
Assembler::Operand::Register(UNWIND_CONTEXT_BASE),
Assembler::Operand::Register(STACK_POINTER));
// align stack pointer
m_assembler.sub(Assembler::Operand::Register(STACK_POINTER), Assembler::Operand::Imm(8));
}
void Compiler::pop_unwind_context()
{
m_assembler.add(Assembler::Operand::Register(STACK_POINTER), Assembler::Operand::Imm(32));
m_assembler.add(Assembler::Operand::Register(UNWIND_CONTEXT_BASE), Assembler::Operand::Imm(32));
}
void Compiler::compile_enter_unwind_context(Bytecode::Op::EnterUnwindContext const& op)
{
push_unwind_context(true, op.handler_target(), op.finalizer_target());
m_assembler.jump(label_for(op.entry_point().block()));
}
void Compiler::compile_leave_unwind_context(Bytecode::Op::LeaveUnwindContext const&)
{
pop_unwind_context();
}
void Compiler::compile_throw(Bytecode::Op::Throw const&)
{
load_vm_register(GPR0, Bytecode::Register::accumulator());
store_vm_register(Bytecode::Register::exception(), GPR0);
check_exception();
}
static ThrowCompletionOr<Value> abstract_inequals(VM& vm, Value src1, Value src2)
{
return Value(!TRY(is_loosely_equal(vm, src1, src2)));
}
static ThrowCompletionOr<Value> abstract_equals(VM& vm, Value src1, Value src2)
{
return Value(TRY(is_loosely_equal(vm, src1, src2)));
}
static ThrowCompletionOr<Value> typed_inequals(VM&, Value src1, Value src2)
{
return Value(!is_strictly_equal(src1, src2));
}
static ThrowCompletionOr<Value> typed_equals(VM&, Value src1, Value src2)
{
return Value(is_strictly_equal(src1, src2));
}
# define DO_COMPILE_COMMON_BINARY_OP(TitleCaseName, snake_case_name) \
static Value cxx_##snake_case_name(VM& vm, Value lhs, Value rhs) \
{ \
return TRY_OR_SET_EXCEPTION(snake_case_name(vm, lhs, rhs)); \
} \
\
void Compiler::compile_##snake_case_name(Bytecode::Op::TitleCaseName const& op) \
{ \
load_vm_register(ARG1, op.lhs()); \
load_vm_register(ARG2, Bytecode::Register::accumulator()); \
native_call((void*)cxx_##snake_case_name); \
store_vm_register(Bytecode::Register::accumulator(), RET); \
check_exception(); \
}
JS_ENUMERATE_COMMON_BINARY_OPS_WITHOUT_FAST_PATH(DO_COMPILE_COMMON_BINARY_OP)
# undef DO_COMPILE_COMMON_BINARY_OP
static Value cxx_add(VM& vm, Value lhs, Value rhs)
{
return TRY_OR_SET_EXCEPTION(add(vm, lhs, rhs));
}
void Compiler::compile_add(Bytecode::Op::Add const& op)
{
load_vm_register(ARG1, op.lhs());
load_vm_register(ARG2, Bytecode::Register::accumulator());
Assembler::Label end {};
Assembler::Label slow_case {};
branch_if_both_int32(ARG1, ARG2, [&] {
// GPR0 = ARG1 + ARG2 (32-bit)
// if (overflow) goto slow_case;
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(ARG1));
m_assembler.add32(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(ARG2),
slow_case);
// accumulator = GPR0 | SHIFTED_INT32_TAG;
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(SHIFTED_INT32_TAG));
m_assembler.bitwise_or(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(GPR1));
store_vm_register(Bytecode::Register::accumulator(), GPR0);
m_assembler.jump(end);
});
slow_case.link(m_assembler);
native_call((void*)cxx_add);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
end.link(m_assembler);
}
static Value cxx_less_than(VM& vm, Value lhs, Value rhs)
{
return TRY_OR_SET_EXCEPTION(less_than(vm, lhs, rhs));
}
void Compiler::compile_less_than(Bytecode::Op::LessThan const& op)
{
load_vm_register(ARG1, op.lhs());
load_vm_register(ARG2, Bytecode::Register::accumulator());
Assembler::Label end {};
branch_if_both_int32(ARG1, ARG2, [&] {
// if (ARG1 < ARG2) return true;
// else return false;
Assembler::Label true_case {};
m_assembler.sign_extend_32_to_64_bits(ARG1);
m_assembler.sign_extend_32_to_64_bits(ARG2);
m_assembler.jump_if(
Assembler::Operand::Register(ARG1),
Assembler::Condition::SignedLessThan,
Assembler::Operand::Register(ARG2),
true_case);
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(Value(false).encoded()));
store_vm_register(Bytecode::Register::accumulator(), GPR0);
m_assembler.jump(end);
true_case.link(m_assembler);
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(Value(true).encoded()));
store_vm_register(Bytecode::Register::accumulator(), GPR0);
m_assembler.jump(end);
});
native_call((void*)cxx_less_than);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
end.link(m_assembler);
}
static ThrowCompletionOr<Value> not_(VM&, Value value)
{
return Value(!value.to_boolean());
}
static ThrowCompletionOr<Value> typeof_(VM& vm, Value value)
{
return PrimitiveString::create(vm, value.typeof());
}
# define DO_COMPILE_COMMON_UNARY_OP(TitleCaseName, snake_case_name) \
static Value cxx_##snake_case_name(VM& vm, Value value) \
{ \
return TRY_OR_SET_EXCEPTION(snake_case_name(vm, value)); \
} \
\
void Compiler::compile_##snake_case_name(Bytecode::Op::TitleCaseName const&) \
{ \
load_vm_register(ARG1, Bytecode::Register::accumulator()); \
native_call((void*)cxx_##snake_case_name); \
store_vm_register(Bytecode::Register::accumulator(), RET); \
check_exception(); \
}
JS_ENUMERATE_COMMON_UNARY_OPS(DO_COMPILE_COMMON_UNARY_OP)
# undef DO_COMPILE_COMMON_UNARY_OP
void Compiler::compile_return(Bytecode::Op::Return const&)
{
load_vm_register(GPR0, Bytecode::Register::accumulator());
// check for finalizer
// if (!unwind_context.valid) goto normal_return;
Assembler::Label normal_return {};
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Mem64BaseAndOffset(UNWIND_CONTEXT_BASE, 0));
m_assembler.jump_if(
Assembler::Operand::Register(GPR1),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
normal_return);
// if (!unwind_context.finalizer) goto normal_return;
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Mem64BaseAndOffset(UNWIND_CONTEXT_BASE, 16));
m_assembler.jump_if(
Assembler::Operand::Register(GPR1),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
normal_return);
store_vm_register(Bytecode::Register::saved_return_value(), GPR0);
m_assembler.jump(Assembler::Operand::Register(GPR1));
// normal_return:
normal_return.link(m_assembler);
store_vm_register(Bytecode::Register::return_value(), GPR0);
jump_to_exit();
}
static Value cxx_new_string(VM& vm, DeprecatedString const& string)
{
return PrimitiveString::create(vm, string);
}
void Compiler::compile_new_string(Bytecode::Op::NewString const& op)
{
auto const& string = m_bytecode_executable.string_table->get(op.index());
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&string)));
native_call((void*)cxx_new_string);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
void Compiler::compile_new_regexp(Bytecode::Op::NewRegExp const& op)
{
auto const& parsed_regex = m_bytecode_executable.regex_table->get(op.regex_index());
auto const& pattern = m_bytecode_executable.string_table->get(op.source_index());
auto const& flags = m_bytecode_executable.string_table->get(op.flags_index());
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&parsed_regex)));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(bit_cast<u64>(&pattern)));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(bit_cast<u64>(&flags)));
native_call((void*)Bytecode::new_regexp);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
static Value cxx_new_bigint(VM& vm, Crypto::SignedBigInteger const& bigint)
{
return BigInt::create(vm, bigint);
}
void Compiler::compile_new_bigint(Bytecode::Op::NewBigInt const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&op.bigint())));
native_call((void*)cxx_new_bigint);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
static Value cxx_new_object(VM& vm)
{
auto& realm = *vm.current_realm();
return Object::create(realm, realm.intrinsics().object_prototype());
}
void Compiler::compile_new_object(Bytecode::Op::NewObject const&)
{
native_call((void*)cxx_new_object);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
static Value cxx_new_array(VM& vm, size_t element_count, u32 first_register_index)
{
auto& realm = *vm.current_realm();
auto array = MUST(Array::create(realm, 0));
for (size_t i = 0; i < element_count; ++i) {
auto& value = vm.bytecode_interpreter().reg(Bytecode::Register(first_register_index + i));
array->indexed_properties().put(i, value, default_attributes);
}
return array;
}
void Compiler::compile_new_array(Bytecode::Op::NewArray const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(op.element_count()));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(op.element_count() ? op.start().index() : 0));
native_call((void*)cxx_new_array);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
void Compiler::compile_new_function(Bytecode::Op::NewFunction const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&op.function_node())));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(bit_cast<u64>(&op.lhs_name())));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(bit_cast<u64>(&op.home_object())));
native_call((void*)Bytecode::new_function);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
static Value cxx_new_class(VM& vm, ClassExpression const& class_expression, Optional<Bytecode::IdentifierTableIndex> const& lhs_name)
{
return TRY_OR_SET_EXCEPTION(Bytecode::new_class(vm, class_expression, lhs_name));
}
void Compiler::compile_new_class(Bytecode::Op::NewClass const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&op.class_expression())));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(bit_cast<u64>(&op.lhs_name())));
native_call((void*)cxx_new_class);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
static Value cxx_get_by_id(VM& vm, Value base, Bytecode::IdentifierTableIndex property, u32 cache_index)
{
return TRY_OR_SET_EXCEPTION(Bytecode::get_by_id(vm.bytecode_interpreter(), property, base, base, cache_index));
}
void Compiler::compile_get_by_id(Bytecode::Op::GetById const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(op.property().value()));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(op.cache_index()));
native_call((void*)cxx_get_by_id);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_by_value(VM& vm, Value base, Value property)
{
return TRY_OR_SET_EXCEPTION(Bytecode::get_by_value(vm.bytecode_interpreter(), base, property));
}
void Compiler::compile_get_by_value(Bytecode::Op::GetByValue const& op)
{
load_vm_register(ARG1, op.base());
load_vm_register(ARG2, Bytecode::Register::accumulator());
native_call((void*)cxx_get_by_value);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_global(VM& vm, Bytecode::IdentifierTableIndex identifier, u32 cache_index)
{
return TRY_OR_SET_EXCEPTION(Bytecode::get_global(vm.bytecode_interpreter(), identifier, cache_index));
}
void Compiler::compile_get_global(Bytecode::Op::GetGlobal const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(op.identifier().value()));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(op.cache_index()));
native_call((void*)cxx_get_global);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_variable(VM& vm, DeprecatedFlyString const& name, u32 cache_index)
{
return TRY_OR_SET_EXCEPTION(Bytecode::get_variable(vm.bytecode_interpreter(), name, cache_index));
}
void Compiler::compile_get_variable(Bytecode::Op::GetVariable const& op)
{
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(op.cache_index()));
native_call((void*)cxx_get_variable);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_callee_and_this_from_environment(VM& vm, DeprecatedFlyString const& name, u32 cache_index, Bytecode::Register callee_reg, Bytecode::Register this_reg)
{
auto& bytecode_interpreter = vm.bytecode_interpreter();
auto callee_and_this = TRY_OR_SET_EXCEPTION(Bytecode::get_callee_and_this_from_environment(
bytecode_interpreter,
name,
cache_index));
bytecode_interpreter.reg(callee_reg) = callee_and_this.callee;
bytecode_interpreter.reg(this_reg) = callee_and_this.this_value;
return {};
}
void Compiler::compile_get_callee_and_this_from_environment(Bytecode::Op::GetCalleeAndThisFromEnvironment const& op)
{
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(op.cache_index()));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(op.callee().index()));
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(op.this_().index()));
native_call((void*)cxx_get_callee_and_this_from_environment);
check_exception();
}
static Value cxx_to_numeric(VM& vm, Value value)
{
return TRY_OR_SET_EXCEPTION(value.to_numeric(vm));
}
void Compiler::compile_to_numeric(Bytecode::Op::ToNumeric const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_to_numeric);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_resolve_this_binding(VM& vm)
{
auto this_value = TRY_OR_SET_EXCEPTION(vm.resolve_this_binding());
vm.bytecode_interpreter().reg(Bytecode::Register::this_value()) = this_value;
return this_value;
}
void Compiler::compile_resolve_this_binding(Bytecode::Op::ResolveThisBinding const&)
{
// OPTIMIZATION: We cache the `this` value in a special VM register.
// So first we check if the cache is non-empty, and if so,
// we can avoid calling out to C++ at all. :^)
load_vm_register(GPR0, Bytecode::Register::this_value());
m_assembler.mov(
Assembler::Operand::Register(GPR1),
Assembler::Operand::Imm(Value().encoded()));
Assembler::Label slow_case {};
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Register(GPR1),
slow_case);
// Fast case: We have a cached `this` value!
store_vm_register(Bytecode::Register::accumulator(), GPR0);
auto end = m_assembler.jump();
slow_case.link(m_assembler);
native_call((void*)cxx_resolve_this_binding);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
end.link(m_assembler);
}
static Value cxx_put_by_id(VM& vm, Value base, Bytecode::IdentifierTableIndex property, Value value, Bytecode::Op::PropertyKind kind)
{
PropertyKey name = vm.bytecode_interpreter().current_executable().get_identifier(property);
TRY_OR_SET_EXCEPTION(Bytecode::put_by_property_key(vm, base, base, value, name, kind));
vm.bytecode_interpreter().accumulator() = value;
return {};
}
void Compiler::compile_put_by_id(Bytecode::Op::PutById const& op)
{
load_vm_register(ARG1, op.base());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(op.property().value()));
load_vm_register(ARG3, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(to_underlying(op.kind())));
native_call((void*)cxx_put_by_id);
check_exception();
}
static Value cxx_put_by_value(VM& vm, Value base, Value property, Value value, Bytecode::Op::PropertyKind kind)
{
TRY_OR_SET_EXCEPTION(Bytecode::put_by_value(vm, base, property, value, kind));
vm.bytecode_interpreter().accumulator() = value;
return {};
}
void Compiler::compile_put_by_value(Bytecode::Op::PutByValue const& op)
{
load_vm_register(ARG1, op.base());
load_vm_register(ARG2, op.property());
load_vm_register(ARG3, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(to_underlying(op.kind())));
native_call((void*)cxx_put_by_value);
check_exception();
}
static Value cxx_call(VM& vm, Value callee, u32 first_argument_index, u32 argument_count, Value this_value, Bytecode::Op::CallType call_type, Optional<Bytecode::StringTableIndex> const& expression_string)
{
TRY_OR_SET_EXCEPTION(throw_if_needed_for_call(vm.bytecode_interpreter(), callee, call_type, expression_string));
MarkedVector<Value> argument_values(vm.heap());
argument_values.ensure_capacity(argument_count);
for (u32 i = 0; i < argument_count; ++i) {
argument_values.unchecked_append(vm.bytecode_interpreter().reg(Bytecode::Register { first_argument_index + i }));
}
return TRY_OR_SET_EXCEPTION(perform_call(vm.bytecode_interpreter(), this_value, call_type, callee, move(argument_values)));
}
void Compiler::compile_call(Bytecode::Op::Call const& op)
{
load_vm_register(ARG1, op.callee());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(op.first_argument().index()));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(op.argument_count()));
load_vm_register(ARG4, op.this_value());
m_assembler.mov(
Assembler::Operand::Register(ARG5),
Assembler::Operand::Imm(to_underlying(op.call_type())));
m_assembler.mov(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Imm(bit_cast<u64>(&op.expression_string())));
native_call((void*)cxx_call, { Assembler::Operand::Register(GPR0) });
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_call_with_argument_array(VM& vm, Value callee, Value this_value, Bytecode::Op::CallType call_type, Optional<Bytecode::StringTableIndex> const& expression_string)
{
TRY_OR_SET_EXCEPTION(throw_if_needed_for_call(vm.bytecode_interpreter(), callee, call_type, expression_string));
auto argument_values = argument_list_evaluation(vm.bytecode_interpreter());
return TRY_OR_SET_EXCEPTION(perform_call(vm.bytecode_interpreter(), this_value, call_type, callee, move(argument_values)));
}
void Compiler::compile_call_with_argument_array(Bytecode::Op::CallWithArgumentArray const& op)
{
load_vm_register(ARG1, op.callee());
load_vm_register(ARG2, op.this_value());
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(to_underlying(op.call_type())));
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(bit_cast<u64>(&op.expression_string())));
native_call((void*)cxx_call_with_argument_array);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_typeof_variable(VM& vm, DeprecatedFlyString const& identifier)
{
return TRY_OR_SET_EXCEPTION(Bytecode::typeof_variable(vm, identifier));
}
void Compiler::compile_typeof_variable(Bytecode::Op::TypeofVariable const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.identifier().value()))));
native_call((void*)cxx_typeof_variable);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_create_variable(
VM& vm,
DeprecatedFlyString const& name,
Bytecode::Op::EnvironmentMode mode,
bool is_global,
bool is_immutable,
bool is_strict)
{
TRY_OR_SET_EXCEPTION(Bytecode::create_variable(vm, name, mode, is_global, is_immutable, is_strict));
return {};
}
void Compiler::compile_create_variable(Bytecode::Op::CreateVariable const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.identifier().value()))));
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(to_underlying(op.mode())));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(static_cast<u64>(op.is_global())));
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(static_cast<u64>(op.is_immutable())));
m_assembler.mov(
Assembler::Operand::Register(ARG5),
Assembler::Operand::Imm(static_cast<u64>(op.is_strict())));
native_call((void*)cxx_create_variable);
check_exception();
}
static Value cxx_set_variable(
VM& vm,
DeprecatedFlyString const& identifier,
Value value,
Bytecode::Op::EnvironmentMode environment_mode,
Bytecode::Op::SetVariable::InitializationMode initialization_mode)
{
TRY_OR_SET_EXCEPTION(Bytecode::set_variable(vm, identifier, value, environment_mode, initialization_mode));
return {};
}
void Compiler::compile_set_variable(Bytecode::Op::SetVariable const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.identifier().value()))));
load_vm_register(ARG2, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(to_underlying(op.mode())));
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(to_underlying(op.initialization_mode())));
native_call((void*)cxx_set_variable);
check_exception();
}
void Compiler::compile_continue_pending_unwind(Bytecode::Op::ContinuePendingUnwind const& op)
{
// re-throw the exception if we reached the end of the finally block and there was no catch block to handle it
check_exception();
// if (!saved_return_value.is_empty()) goto resume_block;
load_vm_register(GPR0, Bytecode::Register::saved_return_value());
m_assembler.mov(Assembler::Operand::Register(GPR1), Assembler::Operand::Imm(Value().encoded()));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Register(GPR1),
label_for(op.resume_target().block()));
// finish the pending return from the try block
store_vm_register(Bytecode::Register::return_value(), GPR0);
jump_to_exit();
}
static void cxx_create_lexical_environment(VM& vm)
{
auto make_and_swap_envs = [&](auto& old_environment) {
GCPtr<Environment> environment = new_declarative_environment(*old_environment).ptr();
swap(old_environment, environment);
return environment;
};
vm.bytecode_interpreter().saved_lexical_environment_stack().append(make_and_swap_envs(vm.running_execution_context().lexical_environment));
}
void Compiler::compile_create_lexical_environment(Bytecode::Op::CreateLexicalEnvironment const&)
{
native_call((void*)cxx_create_lexical_environment);
}
static void cxx_leave_lexical_environment(VM& vm)
{
vm.running_execution_context().lexical_environment = vm.bytecode_interpreter().saved_lexical_environment_stack().take_last();
}
void Compiler::compile_leave_lexical_environment(Bytecode::Op::LeaveLexicalEnvironment const&)
{
native_call((void*)cxx_leave_lexical_environment);
}
static Value cxx_concat_string(VM& vm, Value lhs, Value rhs)
{
auto string = TRY_OR_SET_EXCEPTION(rhs.to_primitive_string(vm));
return PrimitiveString::create(vm, lhs.as_string(), string);
}
void Compiler::compile_concat_string(Bytecode::Op::ConcatString const& op)
{
load_vm_register(ARG1, op.lhs());
load_vm_register(ARG2, Bytecode::Register::accumulator());
native_call((void*)cxx_concat_string);
store_vm_register(op.lhs(), RET);
check_exception();
}
static void cxx_block_declaration_instantiation(VM& vm, ScopeNode const& scope_node)
{
auto old_environment = vm.running_execution_context().lexical_environment;
vm.bytecode_interpreter().saved_lexical_environment_stack().append(old_environment);
vm.running_execution_context().lexical_environment = new_declarative_environment(*old_environment);
scope_node.block_declaration_instantiation(vm, vm.running_execution_context().lexical_environment);
}
void Compiler::compile_block_declaration_instantiation(Bytecode::Op::BlockDeclarationInstantiation const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(bit_cast<u64>(&op.scope_node())));
native_call((void*)cxx_block_declaration_instantiation);
}
static Value cxx_super_call_with_argument_array(VM& vm, Value argument_array, bool is_synthetic)
{
TRY_OR_SET_EXCEPTION(Bytecode::super_call_with_argument_array(vm, argument_array, is_synthetic));
return {};
}
void Compiler::compile_super_call_with_argument_array(Bytecode::Op::SuperCallWithArgumentArray const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(static_cast<u64>(op.is_synthetic())));
native_call((void*)cxx_super_call_with_argument_array);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_iterator(VM& vm, Value value, IteratorHint hint)
{
auto iterator = TRY_OR_SET_EXCEPTION(get_iterator(vm, value, hint));
return Bytecode::iterator_to_object(vm, iterator);
}
void Compiler::compile_get_iterator(Bytecode::Op::GetIterator const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(to_underlying(op.hint())));
native_call((void*)cxx_get_iterator);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_iterator_next(VM& vm, Value iterator)
{
auto iterator_object = TRY_OR_SET_EXCEPTION(iterator.to_object(vm));
auto iterator_record = Bytecode::object_to_iterator(vm, iterator_object);
return TRY_OR_SET_EXCEPTION(iterator_next(vm, iterator_record));
}
void Compiler::compile_iterator_next(Bytecode::Op::IteratorNext const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_iterator_next);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_iterator_result_done(VM& vm, Value iterator)
{
auto iterator_result = TRY_OR_SET_EXCEPTION(iterator.to_object(vm));
return Value(TRY_OR_SET_EXCEPTION(iterator_complete(vm, iterator_result)));
}
void Compiler::compile_iterator_result_done(Bytecode::Op::IteratorResultDone const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_iterator_result_done);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_throw_if_not_object(VM& vm, Value value)
{
if (!value.is_object())
TRY_OR_SET_EXCEPTION(vm.throw_completion<TypeError>(ErrorType::NotAnObject, value.to_string_without_side_effects()));
return {};
}
void Compiler::compile_throw_if_not_object(Bytecode::Op::ThrowIfNotObject const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_throw_if_not_object);
check_exception();
}
static Value cxx_throw_if_nullish(VM& vm, Value value)
{
if (value.is_nullish())
TRY_OR_SET_EXCEPTION(vm.throw_completion<TypeError>(ErrorType::NotObjectCoercible, value.to_string_without_side_effects()));
return {};
}
void Compiler::compile_throw_if_nullish(Bytecode::Op::ThrowIfNullish const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_throw_if_nullish);
check_exception();
}
static Value cxx_iterator_result_value(VM& vm, Value iterator)
{
auto iterator_result = TRY_OR_SET_EXCEPTION(iterator.to_object(vm));
return TRY_OR_SET_EXCEPTION(iterator_value(vm, iterator_result));
}
void Compiler::compile_iterator_result_value(Bytecode::Op::IteratorResultValue const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_iterator_result_value);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_iterator_close(VM& vm, Value iterator, Completion::Type completion_type, Optional<Value> const& completion_value)
{
auto iterator_object = TRY_OR_SET_EXCEPTION(iterator.to_object(vm));
auto iterator_record = Bytecode::object_to_iterator(vm, iterator_object);
// FIXME: Return the value of the resulting completion. (Note that m_completion_value can be empty!)
TRY_OR_SET_EXCEPTION(iterator_close(vm, iterator_record, Completion { completion_type, completion_value, {} }));
return {};
}
void Compiler::compile_iterator_close(Bytecode::Op::IteratorClose const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(to_underlying(op.completion_type())));
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(bit_cast<u64>(&op.completion_value())));
native_call((void*)cxx_iterator_close);
check_exception();
}
static Value iterator_to_array(VM& vm, Value iterator)
{
return TRY_OR_SET_EXCEPTION(Bytecode::iterator_to_array(vm, iterator));
}
void Compiler::compile_iterator_to_array(Bytecode::Op::IteratorToArray const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)iterator_to_array);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_append(VM& vm, Value lhs, Value rhs, bool is_spread)
{
TRY_OR_SET_EXCEPTION(Bytecode::append(vm, lhs, rhs, is_spread));
return {};
}
void Compiler::compile_append(Bytecode::Op::Append const& op)
{
load_vm_register(ARG1, op.lhs());
load_vm_register(ARG2, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(static_cast<u64>(op.is_spread())));
native_call((void*)cxx_append);
check_exception();
}
static Value cxx_delete_by_id(VM& vm, Value base, Bytecode::IdentifierTableIndex property)
{
return TRY_OR_SET_EXCEPTION(Bytecode::delete_by_id(vm.bytecode_interpreter(), base, property));
}
void Compiler::compile_delete_by_id(Bytecode::Op::DeleteById const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(op.property().value()));
native_call((void*)cxx_delete_by_id);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_delete_by_value(VM& vm, Value base_value, Value property_key_value)
{
return TRY_OR_SET_EXCEPTION(Bytecode::delete_by_value(vm.bytecode_interpreter(), base_value, property_key_value));
}
void Compiler::compile_delete_by_value(Bytecode::Op::DeleteByValue const& op)
{
load_vm_register(ARG1, op.base());
load_vm_register(ARG2, Bytecode::Register::accumulator());
native_call((void*)cxx_delete_by_value);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_delete_by_value_with_this(VM& vm, Value base_value, Value property_key_value, Value this_value)
{
return TRY_OR_SET_EXCEPTION(Bytecode::delete_by_value_with_this(vm.bytecode_interpreter(), base_value, property_key_value, this_value));
}
void Compiler::compile_delete_by_value_with_this(Bytecode::Op::DeleteByValueWithThis const& op)
{
load_vm_register(ARG1, op.base());
load_vm_register(ARG2, Bytecode::Register::accumulator());
load_vm_register(ARG3, op.this_value());
native_call((void*)cxx_delete_by_value_with_this);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_object_property_iterator(VM& vm, Value object)
{
return TRY_OR_SET_EXCEPTION(Bytecode::get_object_property_iterator(vm, object));
}
void Compiler::compile_get_object_property_iterator(Bytecode::Op::GetObjectPropertyIterator const&)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
native_call((void*)cxx_get_object_property_iterator);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_private_by_id(VM& vm, Value base_value, DeprecatedFlyString& name)
{
auto private_reference = make_private_reference(vm, base_value, name);
return TRY_OR_SET_EXCEPTION(private_reference.get_value(vm));
}
void Compiler::compile_get_private_by_id(Bytecode::Op::GetPrivateById const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.property()))));
native_call((void*)cxx_get_private_by_id);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_resolve_super_base(VM& vm)
{
// 1. Let env be GetThisEnvironment().
auto& env = verify_cast<FunctionEnvironment>(*get_this_environment(vm));
// 2. Assert: env.HasSuperBinding() is true.
VERIFY(env.has_super_binding());
// 3. Let baseValue be ? env.GetSuperBase().
return TRY_OR_SET_EXCEPTION(env.get_super_base());
}
void Compiler::compile_resolve_super_base(Bytecode::Op::ResolveSuperBase const&)
{
native_call((void*)cxx_resolve_super_base);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_by_id_with_this(VM& vm, Bytecode::IdentifierTableIndex property, Value base_value, Value this_value, u32 cache_index)
{
return TRY_OR_SET_EXCEPTION(get_by_id(vm.bytecode_interpreter(), property, base_value, this_value, cache_index));
}
void Compiler::compile_get_by_id_with_this(Bytecode::Op::GetByIdWithThis const& op)
{
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(op.property().value()));
load_vm_register(ARG2, Bytecode::Register::accumulator());
load_vm_register(ARG3, op.this_value());
m_assembler.mov(
Assembler::Operand::Register(ARG4),
Assembler::Operand::Imm(op.cache_index()));
native_call((void*)cxx_get_by_id_with_this);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_get_by_value_with_this(VM& vm, Value property_key_value, Value base, Value this_value)
{
auto object = TRY_OR_SET_EXCEPTION(base.to_object(vm));
auto property_key = TRY_OR_SET_EXCEPTION(property_key_value.to_property_key(vm));
return TRY_OR_SET_EXCEPTION(object->internal_get(property_key, this_value));
}
void Compiler::compile_get_by_value_with_this(Bytecode::Op::GetByValueWithThis const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
load_vm_register(ARG2, op.base());
load_vm_register(ARG3, op.this_value());
native_call((void*)cxx_get_by_value_with_this);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
static Value cxx_delete_by_id_with_this(VM& vm, Value base_value, DeprecatedFlyString const& identifier, Value this_value)
{
auto reference = Reference { base_value, identifier, this_value, vm.in_strict_mode() };
return Value(TRY_OR_SET_EXCEPTION(reference.delete_(vm)));
}
void Compiler::compile_delete_by_id_with_this(Bytecode::Op::DeleteByIdWithThis const& op)
{
load_vm_register(ARG1, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG2),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.property()))));
load_vm_register(ARG3, op.this_value());
native_call((void*)cxx_delete_by_id_with_this);
store_vm_register(Bytecode::Register::accumulator(), RET);
}
static Value cxx_put_by_id_with_this(VM& vm, Value base, Value value, DeprecatedFlyString const& name, Value this_value, Bytecode::Op::PropertyKind kind)
{
TRY_OR_SET_EXCEPTION(Bytecode::put_by_property_key(vm, base, this_value, value, name, kind));
return {};
}
void Compiler::compile_put_by_id_with_this(Bytecode::Op::PutByIdWithThis const& op)
{
load_vm_register(ARG1, op.base());
load_vm_register(ARG2, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.property()))));
load_vm_register(ARG4, op.this_value());
m_assembler.mov(
Assembler::Operand::Register(ARG5),
Assembler::Operand::Imm(to_underlying(op.kind())));
native_call((void*)cxx_put_by_id_with_this);
check_exception();
}
static Value cxx_put_private_by_id(VM& vm, Value base, Value value, DeprecatedFlyString const& name)
{
auto object = TRY_OR_SET_EXCEPTION(base.to_object(vm));
auto private_reference = make_private_reference(vm, object, name);
TRY_OR_SET_EXCEPTION(private_reference.put_value(vm, value));
return value;
}
void Compiler::compile_put_private_by_id(Bytecode::Op::PutPrivateById const& op)
{
load_vm_register(ARG1, op.base());
load_vm_register(ARG2, Bytecode::Register::accumulator());
m_assembler.mov(
Assembler::Operand::Register(ARG3),
Assembler::Operand::Imm(bit_cast<u64>(&m_bytecode_executable.get_identifier(op.property()))));
native_call((void*)cxx_put_private_by_id);
store_vm_register(Bytecode::Register::accumulator(), RET);
check_exception();
}
void Compiler::jump_to_exit()
{
m_assembler.jump(m_exit_label);
}
void Compiler::native_call(void* function_address, Vector<Assembler::Operand> const& stack_arguments)
{
// Make sure we don't clobber the VM&.
m_assembler.push(Assembler::Operand::Register(ARG0));
// Align the stack pointer.
m_assembler.sub(Assembler::Operand::Register(STACK_POINTER), Assembler::Operand::Imm(8));
// NOTE: We don't preserve caller-saved registers when making a native call.
// This means that they may have changed after we return from the call.
m_assembler.native_call(function_address, stack_arguments);
// Restore the stack pointer.
m_assembler.add(Assembler::Operand::Register(STACK_POINTER), Assembler::Operand::Imm(8));
// Restore our VM&.
m_assembler.pop(Assembler::Operand::Register(ARG0));
}
OwnPtr<NativeExecutable> Compiler::compile(Bytecode::Executable& bytecode_executable)
{
if (!getenv("LIBJS_JIT"))
return nullptr;
Compiler compiler { bytecode_executable };
compiler.m_assembler.enter();
compiler.m_assembler.mov(
Assembler::Operand::Register(REGISTER_ARRAY_BASE),
Assembler::Operand::Register(ARG1));
compiler.m_assembler.mov(
Assembler::Operand::Register(LOCALS_ARRAY_BASE),
Assembler::Operand::Register(ARG2));
compiler.push_unwind_context(false, {}, {});
for (auto& block : bytecode_executable.basic_blocks) {
compiler.block_data_for(*block).start_offset = compiler.m_output.size();
auto it = Bytecode::InstructionStreamIterator(block->instruction_stream());
while (!it.at_end()) {
auto const& op = *it;
switch (op.type()) {
# define CASE_BYTECODE_OP(OpTitleCase, op_snake_case) \
case Bytecode::Instruction::Type::OpTitleCase: \
compiler.compile_##op_snake_case(static_cast<Bytecode::Op::OpTitleCase const&>(op)); \
break;
JS_ENUMERATE_IMPLEMENTED_JIT_OPS(CASE_BYTECODE_OP)
# undef CASE_BYTECODE_OP
default:
if constexpr (LOG_JIT_FAILURE) {
dbgln("\033[31;1mJIT compilation failed\033[0m: {}", bytecode_executable.name);
dbgln("Unsupported bytecode op: {}", op.to_deprecated_string(bytecode_executable));
}
return nullptr;
}
++it;
}
if (!block->is_terminated())
compiler.jump_to_exit();
}
compiler.m_exit_label.link(compiler.m_assembler);
compiler.m_assembler.exit();
if (!compiler.m_exception_handler.jump_slot_offsets_in_instruction_stream.is_empty()) {
compiler.m_exception_handler.link(compiler.m_assembler);
compiler.handle_exception();
}
auto* executable_memory = mmap(nullptr, compiler.m_output.size(), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
if (executable_memory == MAP_FAILED) {
dbgln("mmap: {}", strerror(errno));
return nullptr;
}
for (auto& block : bytecode_executable.basic_blocks) {
auto& block_data = compiler.block_data_for(*block);
block_data.label.link_to(compiler.m_assembler, block_data.start_offset);
// Patch up all the absolute references
for (auto& absolute_reference : block_data.absolute_references_to_here) {
auto offset = bit_cast<u64>(executable_memory) + block_data.start_offset;
compiler.m_output[absolute_reference + 0] = (offset >> 0) & 0xff;
compiler.m_output[absolute_reference + 1] = (offset >> 8) & 0xff;
compiler.m_output[absolute_reference + 2] = (offset >> 16) & 0xff;
compiler.m_output[absolute_reference + 3] = (offset >> 24) & 0xff;
compiler.m_output[absolute_reference + 4] = (offset >> 32) & 0xff;
compiler.m_output[absolute_reference + 5] = (offset >> 40) & 0xff;
compiler.m_output[absolute_reference + 6] = (offset >> 48) & 0xff;
compiler.m_output[absolute_reference + 7] = (offset >> 56) & 0xff;
}
}
if constexpr (DUMP_JIT_MACHINE_CODE_TO_STDOUT) {
(void)write(STDOUT_FILENO, compiler.m_output.data(), compiler.m_output.size());
}
memcpy(executable_memory, compiler.m_output.data(), compiler.m_output.size());
if (mprotect(executable_memory, compiler.m_output.size(), PROT_READ | PROT_EXEC) < 0) {
dbgln("mprotect: {}", strerror(errno));
return nullptr;
}
if constexpr (LOG_JIT_SUCCESS) {
dbgln("\033[32;1mJIT compilation succeeded!\033[0m {}", bytecode_executable.name);
}
auto executable = make<NativeExecutable>(executable_memory, compiler.m_output.size());
if constexpr (DUMP_JIT_DISASSEMBLY)
executable->dump_disassembly();
return executable;
}
}
#endif
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