RustPython/crates/compiler-core/src/bytecode.rs at 3f93b22da4df1235d264160cacc63491c63bd440 · youknowone/RustPython

Repository navigation

History

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

320

321

322

323

324

325

326

327

328

329

330

331

332

333

334

335

336

337

338

339

340

341

342

343

344

345

346

347

348

349

350

351

352

353

354

355

356

357

358

359

360

361

362

363

364

365

366

367

368

369

370

371

372

373

374

375

376

377

378

379

380

381

382

383

384

385

386

387

388

389

390

391

392

393

394

395

396

397

398

399

400

401

402

403

404

405

406

407

408

409

410

411

412

413

414

415

416

417

418

419

420

421

422

423

424

425

426

427

428

429

430

431

432

433

434

435

436

437

438

439

440

441

442

443

444

445

446

447

448

449

450

451

452

453

454

455

456

457

458

459

460

461

462

463

464

465

466

467

468

469

470

471

472

473

474

475

476

477

478

479

480

481

482

483

484

485

486

487

488

489

490

491

492

493

494

495

496

497

498

499

500

501

502

503

504

505

506

507

508

509

510

511

512

513

514

515

516

517

518

519

520

521

522

523

524

525

526

527

528

529

530

531

532

533

534

535

536

537

538

539

540

541

542

543

544

545

546

547

548

549

550

551

552

553

554

555

556

557

558

559

560

561

562

563

564

565

566

567

568

569

570

571

572

573

574

575

576

577

578

579

580

581

582

583

584

585

586

587

588

589

590

591

592

593

594

595

596

597

598

599

600

601

602

603

604

605

606

607

608

609

610

611

612

613

614

615

616

617

618

619

620

621

622

623

624

625

626

627

628

629

630

631

632

633

634

635

636

637

638

639

640

641

642

643

644

645

646

647

648

649

650

651

652

653

654

655

656

657

658

659

660

661

662

663

664

665

666

667

668

669

670

671

672

673

674

675

676

677

678

679

680

681

682

683

684

685

686

687

688

689

690

691

692

693

694

695

696

697

698

699

700

701

702

703

704

705

706

707

708

709

710

711

712

713

714

715

716

717

718

719

720

721

722

723

724

725

726

727

728

729

730

731

732

733

734

735

736

737

738

739

740

741

742

743

744

745

746

747

748

749

750

751

752

753

754

755

756

757

758

759

760

761

762

763

764

765

766

767

768

769

770

771

772

773

774

775

776

777

778

779

780

781

782

783

784

785

786

787

788

789

790

791

792

793

794

795

796

797

798

799

800

801

802

803

804

805

806

807

808

809

810

811

812

813

814

815

816

817

818

819

820

821

822

823

824

825

826

827

828

829

830

831

832

833

834

835

836

837

838

839

840

841

842

843

844

845

846

847

848

849

850

851

852

853

854

855

856

857

858

859

860

861

862

863

864

865

866

867

868

869

870

871

872

873

874

875

876

877

878

879

880

881

882

883

884

885

886

887

888

889

890

891

892

893

894

895

896

897

898

899

900

901

902

903

904

905

906

907

908

909

910

911

912

913

914

915

916

917

918

919

920

921

922

923

924

925

926

927

928

929

930

931

932

933

934

935

936

937

938

939

940

941

942

943

944

945

946

947

948

949

950

951

952

953

954

955

956

957

958

959

960

961

962

963

964

965

966

967

968

969

970

971

972

973

974

975

976

977

978

979

980

981

982

983

984

985

986

987

988

989

990

991

992

993

994

995

996

997

998

999

1000

//! Implement python as a virtual machine with bytecode. This module

//! implements bytecode structure.

use crate::{

marshal::MarshalError,

varint::{read_varint, read_varint_with_start, write_varint, write_varint_with_start},

{OneIndexed, SourceLocation},

};

use alloc::{borrow::ToOwned, boxed::Box, collections::BTreeSet, fmt, string::String, vec::Vec};

use bitflags::bitflags;

use core::{

cell::UnsafeCell,

hash, mem,

ops::{Deref, Index, IndexMut},

sync::atomic::{AtomicU8, AtomicU16, AtomicUsize, Ordering},

};

use itertools::Itertools;

use malachite_bigint::BigInt;

use num_complex::Complex64;

use rustpython_wtf8::{Wtf8, Wtf8Buf};

pub use crate::bytecode::{

instruction::{

AnyInstruction, Arg, Instruction, InstructionMetadata, PseudoInstruction, StackEffect,

oparg::{

BinaryOperator, BuildSliceArgCount, CommonConstant, ComparisonOperator, ConvertValueOparg,

IntrinsicFunction1, IntrinsicFunction2, Invert, Label, LoadAttr, LoadSuperAttr,

MakeFunctionFlag, MakeFunctionFlags, NameIdx, OpArg, OpArgByte, OpArgState, OpArgType,

RaiseKind, ResumeType, SpecialMethod, UnpackExArgs,

};

mod instruction;

pub mod oparg;

/// Exception table entry for zero-cost exception handling

/// Format: (start, size, target, depth<<1|lasti)

#[derive(Clone, Copy, Debug, PartialEq, Eq)]

pub struct ExceptionTableEntry {

/// Start instruction offset (inclusive)

pub start: u32,

/// End instruction offset (exclusive)

pub end: u32,

/// Handler target offset

pub target: u32,

/// Stack depth at handler entry

pub depth: u16,

/// Whether to push lasti before exception

pub push_lasti: bool,

}

impl ExceptionTableEntry {

pub const fn new(start: u32, end: u32, target: u32, depth: u16, push_lasti: bool) -> Self {

Self {

start,

end,

target,

depth,

push_lasti,

}

/// Encode exception table entries.

/// Uses 6-bit varint encoding with start marker (MSB) and continuation bit.

pub fn encode_exception_table(entries: &[ExceptionTableEntry]) -> alloc::boxed::Box<[u8]> {

let mut data = Vec::new();

for entry in entries {

let size = entry.end.saturating_sub(entry.start);

let depth_lasti = ((entry.depth as u32) << 1) | (entry.push_lasti as u32);

write_varint_with_start(&mut data, entry.start);

write_varint(&mut data, size);

write_varint(&mut data, entry.target);

write_varint(&mut data, depth_lasti);

}

data.into_boxed_slice()

}

/// Find exception handler for given instruction offset.

pub fn find_exception_handler(table: &[u8], offset: u32) -> Option<ExceptionTableEntry> {

let mut pos = 0;

while pos < table.len() {

let start = read_varint_with_start(table, &mut pos)?;

let size = read_varint(table, &mut pos)?;

let class=pl-en>read_varint(table, &mut pos)?;

let depth_lasti = read_varint(table, &mut pos)?;

let end = start + size;

let depth = (depth_lasti >> 1) as u16;

let push_lasti = (depth_lasti & 1) != 0;

if offset >= start && offset < end {

return Some(ExceptionTableEntry {

start,

end,

target,

depth,

push_lasti,

});

}

None

}

/// Decode all exception table entries.

pub fn decode_exception_table(table: &[u8]) -> Vec<ExceptionTableEntry> {

let mut entries = Vec::new();

let mut pos = 0;

while pos < table.len() {

let Some(start) = read_varint_with_start(table, &mut pos) else {

break;

};

let Some(size) = read_varint(table, &mut pos) else {

break;

};

let Some(target) = read_varint(table, &mut pos) else {

break;

};

let Some(depth_lasti) = read_varint(table, &mut pos) else {

break;

};

let Some(end) = start.checked_add(size) else {

break;

};

entries.push(ExceptionTableEntry {

start,

end,

target,

depth: (depth_lasti >> 1) as u16,

push_lasti: (depth_lasti & 1) != 0,

});

}

entries

}

/// CPython 3.11+ linetable location info codes

#[derive(Copy, Clone, Debug, PartialEq, Eq)]

#[repr(u8)]

pub enum PyCodeLocationInfoKind {

// Short forms are 0 to 9

Short0 = 0,

Short1 = 1,

Short2 = 2,

Short3 = 3,

Short4 = 4,

Short5 = 5,

Short6 = 6,

Short7 = 7,

Short8 = 8,

Short9 = 9,

// One line forms are 10 to 12

OneLine0 = 10,

OneLine1 = 11,

OneLine2 = 12,

NoColumns = 13,

Long = 14,

None = 15,

}

impl PyCodeLocationInfoKind {

pub fn from_code(code: u8) -> Option<Self> {

match code {

0 => Some(Self::Short0),

1 => Some(Self::Short1),

2 => Some(Self::Short2),

3 => Some(Self::Short3),

4 => Some(Self::Short4),

5 => Some(Self::Short5),

6 => Some(Self::Short6),

7 => Some(Self::Short7),

8 => Some(Self::Short8),

9 => Some(Self::Short9),

10 => Some(Self::OneLine0),

11 => Some(Self::OneLine1),

12 => Some(Self::OneLine2),

13 => Some(Self::NoColumns),

14 => Some(Self::Long),

15 => Some(Self::None),

_ => Option::None,

}

pub fn is_short(&self) -> bool {

(*self as u8) <= 9

}

pub fn short_column_group(&self) -> Option<u8> {

if self.is_short() {

Some(*self as u8)

} else {

Option::None

}

pub fn one_line_delta(&self) -> Option<i32> {

match self {

Self::OneLine0 => Some(0),

Self::OneLine1 => Some(1),

Self::OneLine2 => Some(2),

_ => Option::None,

}

pub trait Constant: Sized {

type Name: AsRef<str>;

/// Transforms the given Constant to a BorrowedConstant

fn borrow_constant(&self) -> BorrowedConstant<'_, Self>;

}

impl Constant for ConstantData {

type Name = String;

fn borrow_constant(&self) -> BorrowedConstant<'_, Self> {

use BorrowedConstant::*;

match self {

Self::Integer { value } => Integer { value },

Self::Float { value } => Float { value: *value },

Self::Complex { value } => Complex { value: *value },

Self::Boolean { value } => Boolean { value: *value },

Self::Str { value } => Str { value },

Self::Bytes { value } => Bytes { value },

Self::Code { code } => Code { code },

Self::Tuple { elements } => Tuple { elements },

Self::None => None,

Self::Ellipsis => Ellipsis,

}

/// A Constant Bag

pub trait ConstantBag: Sized + Copy {

type Constant: Constant;

fn make_constant<C: Constant>(&self, constant: BorrowedConstant<'_, C>) -> Self::Constant;

fn make_int(&self, value: BigInt) -> Self::Constant;

fn make_tuple(&self, elements: impl Iterator<Item = Self::Constant>) -> Self::Constant;

fn make_code(&self, code: CodeObject<Self::Constant>) -> Self::Constant;

fn make_name(&self, name: &str) -> <Self::Constant as Constant>::Name;

}

pub trait AsBag {

type Bag: ConstantBag;

#[allow(clippy::wrong_self_convention)]

fn as_bag(self) -> Self::Bag;

}

impl<Bag: ConstantBag> AsBag for Bag {

type Bag = Self;

fn as_bag(self) -> Self {

self

}

#[derive(Clone, Copy)]

pub struct BasicBag;

impl ConstantBag for BasicBag {

type Constant = ConstantData;

fn make_constant<C: Constant>(&self, constant: BorrowedConstant<'_, C>) -> Self::Constant {

constant.to_owned()

}

fn make_int(&self, value: BigInt) -> Self::Constant {

ConstantData::Integer { value }

}

fn make_tuple(&self, elements: impl Iterator<Item = Self::Constant>) -> Self::Constant {

ConstantData::Tuple {

elements: elements.collect(),

}

fn make_code(&self, code: CodeObject<Self::Constant>) -> Self::Constant {

ConstantData::Code {

code: Box::new(code),

}

fn make_name(&self, name: &str) -> <Self::Constant as Constant>::Name {

name.to_owned()

}

#[derive(Clone)]

pub struct Constants<C: Constant>(Box<[C]>);

impl<C: Constant> Deref for Constants<C> {

type Target = [C];

fn deref(&self) -> &Self::Target {

&self.0

}

impl<C: Constant> Index<oparg::ConstIdx> for Constants<C> {

type Output = C;

fn index(&self, consti: oparg::ConstIdx) -> &Self::Output {

&self.0[consti.as_usize()]

}

impl<C: Constant> FromIterator<C> for Constants<C> {

fn from_iter<T: IntoIterator<Item = C>>(iter: T) -> Self {

Self(iter.into_iter().collect())

}

// TODO: Newtype "CodeObject.varnames". Make sure only `oparg:VarNum` can be used as index

impl<T> Index<oparg::VarNum> for [T] {

type Output = T;

fn index(&self, var_num: oparg::VarNum) -> &Self::Output {

&self[var_num.as_usize()]

}

// TODO: Newtype "CodeObject.varnames". Make sure only `oparg:VarNum` can be used as index

impl<T> IndexMut<oparg::VarNum> for [T] {

fn index_mut(&mut self, var_num: oparg::VarNum) -> &mut Self::Output {

&mut self[var_num.as_usize()]

}

/// Primary container of a single code object. Each python function has

/// a code object. Also a module has a code object.

#[derive(Clone)]

pub struct CodeObject<C: Constant = ConstantData> {

pub instructions: CodeUnits,

pub locations: Box<[(SourceLocation, SourceLocation)]>,

pub flags: CodeFlags,

/// Number of positional-only arguments

pub posonlyarg_count: u32,

pub arg_count: u32,

pub kwonlyarg_count: u32,

pub source_path: C::Name,

pub first_line_number: Option<OneIndexed>,

pub max_stackdepth: u32,

/// Name of the object that created this code object

pub obj_name: C::Name,

/// Qualified name of the object (like CPython's co_qualname)

pub qualname: C::Name,

pub cell2arg: Option<Box<[i32]>>,

pub constants: Constants<C>,

pub names: Box<[C::Name]>,

pub varnames: Box<[C::Name]>,

pub cellvars: Box<[C::Name]>,

pub freevars: Box<[C::Name]>,

/// Line number table (CPython 3.11+ format)

pub linetable: Box<[u8]>,

/// Exception handling table

pub exceptiontable: Box<[u8]>,

}

bitflags! {

#[derive(Copy, Clone, Debug, PartialEq)]

pub struct CodeFlags: u32 {

const OPTIMIZED = 0x0001;

const NEWLOCALS = 0x0002;

const VARARGS = 0x0004;

const VARKEYWORDS = 0x0008;

const GENERATOR = 0x0020;

const COROUTINE = 0x0080;

const ITERABLE_COROUTINE = 0x0100;

/// If a code object represents a function and has a docstring,

/// this bit is set and the first item in co_consts is the docstring.

const HAS_DOCSTRING = 0x4000000;

}

#[repr(C)]

#[derive(Copy, Clone, Debug)]

pub struct CodeUnit {

pub op: Instruction,

pub arg: OpArgByte,

}

const _: () = assert!(mem::size_of::<CodeUnit>() == 2);

/// Adaptive specialization: number of executions before attempting specialization.

///

/// Matches CPython's `_Py_BackoffCounter` encoding.

pub const ADAPTIVE_WARMUP_VALUE: u16 = adaptive_counter_bits(1, 1);

/// Adaptive specialization: cooldown counter after a successful specialization.

///

/// Value/backoff = (52, 0), matching CPython's ADAPTIVE_COOLDOWN bits.

pub const ADAPTIVE_COOLDOWN_VALUE: u16 = adaptive_counter_bits(52, 0);

/// Initial JUMP_BACKWARD counter bits (value/backoff = 4095/12).

pub const JUMP_BACKWARD_INITIAL_VALUE: u16 = adaptive_counter_bits(4095, 12);

const BACKOFF_BITS: u16 = 4;

const MAX_BACKOFF: u16 = 12;

const UNREACHABLE_BACKOFF: u16 = 15;

/// Encode an adaptive counter as `(value << 4) | backoff`.

pub const fn adaptive_counter_bits(value: u16, backoff: u16) -> u16 {

(value << BACKOFF_BITS) | backoff

}

/// True when the adaptive counter should trigger specialization.

#[inline]

pub const fn adaptive_counter_triggers(counter: u16) -> bool {

counter < UNREACHABLE_BACKOFF

}

/// Decrement adaptive counter by one countdown step.

#[inline]

pub const fn advance_adaptive_counter(counter: u16) -> u16 {

counter.wrapping_sub(1 << BACKOFF_BITS)

}

/// Reset adaptive counter with exponential backoff.

#[inline]

pub const fn adaptive_counter_backoff(counter: u16) -> u16 {

let backoff = counter & ((1 << BACKOFF_BITS) - 1);

if backoff < MAX_BACKOFF {

adaptive_counter_bits((1 << (backoff + 1)) - 1, backoff + 1)

} else {

adaptive_counter_bits((1 << MAX_BACKOFF) - 1, MAX_BACKOFF)

}

impl CodeUnit {

pub const fn new(op: Instruction, arg: OpArgByte) -> Self {

Self { op, arg }

}

impl TryFrom<&[u8]> for CodeUnit {

type Error = MarshalError;

fn try_from(value: &[u8]) -> Result<Self, Self::Error> {

match value.len() {

2 => Ok(Self::new(value[0].try_into()?, value[1].into())),

_ => Err(Self::Error::InvalidBytecode),

}

pub struct CodeUnits {

units: UnsafeCell<Box<[CodeUnit]>>,

adaptive_counters: Box<[AtomicU16]>,

/// Pointer-sized cache entries for descriptor pointers.

/// Single atomic load/store prevents torn reads when multiple threads

/// specialize the same instruction concurrently.

pointer_cache: Box<[AtomicUsize]>,

}

// SAFETY: All cache operations use atomic read/write instructions.

// - replace_op / compare_exchange_op: AtomicU8 store/CAS (Release)

// - cache read/write: AtomicU16 load/store (Relaxed)

// - adaptive counter: AtomicU16 load/store (Relaxed)

// Ordering is established by:

// - replace_op (Release) ↔ dispatch loop read_op (Acquire) for cache data visibility

// - tp_version_tag (Acquire) for descriptor pointer validity

unsafe impl Sync for CodeUnits {}

impl Clone for CodeUnits {

fn clone(&self) -> Self {

// SAFETY: No concurrent mutation during clone — cloning is only done

// during code object construction or marshaling, not while instrumented.

let units = unsafe { &*self.units.get() }.clone();

let adaptive_counters = self

.adaptive_counters

.iter()

.map(|c| AtomicU16::new(c.load(Ordering::Relaxed)))

.collect();

let pointer_cache = self

.pointer_cache

.iter()

.map(|c| AtomicUsize::new(c.load(Ordering::Relaxed)))

.collect();

Self {

units: UnsafeCell::new(units),

adaptive_counters,

pointer_cache,

}

impl fmt::Debug for CodeUnits {

fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

// SAFETY: Debug formatting doesn't race with replace_op

let inner = unsafe { &*self.units.get() };

f.debug_tuple("CodeUnits").field(inner).finish()

}

impl TryFrom<&[u8]> for CodeUnits {

type Error = MarshalError;

fn try_from(value: &[u8]) -> Result<Self, Self::Error> {

if !value.len().is_multiple_of(2) {

return Err(Self::Error::InvalidBytecode);

}

let units = value

.chunks_exact(2)

.map(CodeUnit::try_from)

.collect::<Result<Vec<_>, _>>()?;

Ok(units.into())

}

impl<const N: usize> From<[CodeUnit; N]> for CodeUnits {

fn from(value: [CodeUnit; N]) -> Self {

Self::from(Vec::from(value))

}

impl From<Vec<CodeUnit>> for CodeUnits {

fn from(value: Vec<CodeUnit>) -> Self {

let units = value.into_boxed_slice();

let len = units.len();

let adaptive_counters = (0..len)

.map(|_| AtomicU16::new(0))

.collect::<Vec<_>>()

.into_boxed_slice();

let pointer_cache = (0..len)

.map(|_| AtomicUsize::new(0))

.collect::<Vec<_>>()

.into_boxed_slice();

Self {

units: UnsafeCell::new(units),

adaptive_counters,

pointer_cache,

}

impl FromIterator<CodeUnit> for CodeUnits {

fn from_iter<T: IntoIterator<Item = CodeUnit>>(iter: T) -> Self {

Self::from(iter.into_iter().collect::<Vec<_>>())

}

impl Deref for CodeUnits {

type Target = [CodeUnit];

fn deref(&self) -> &Self::Target {

// SAFETY: Shared references to the slice are valid even while replace_op

// may update individual opcode bytes — readers tolerate stale opcodes

// (they will re-read on the next iteration).

unsafe { &*self.units.get() }

}

impl CodeUnits {

/// Replace the opcode at `index` in-place without changing the arg byte.

/// Uses atomic Release store to ensure prior cache writes are visible

/// to threads that subsequently read the new opcode with Acquire.

///

/// # Safety

/// - `index` must be in bounds.

/// - `new_op` must have the same arg semantics as the original opcode.

pub unsafe fn replace_op(&self, index: usize, new_op: Instruction) {

let units = unsafe { &*self.units.get() };

let ptr = units.as_ptr().wrapping_add(index) as *const AtomicU8;

unsafe { &*ptr }.store(new_op.into(), Ordering::Release);

}

/// Atomically replace opcode only if it still matches `expected`.

/// Returns true on success. Uses Release ordering on success.

///

/// # Safety

/// - `index` must be in bounds.

pub unsafe fn compare_exchange_op(

&self,

index: usize,

expected: Instruction,

new_op: Instruction,

) -> bool {

let units = unsafe { &*self.units.get() };

let ptr = units.as_ptr().wrapping_add(index) as *const AtomicU8;

unsafe { &*ptr }

.compare_exchange(

expected.into(),

new_op.into(),

Ordering::Release,

Ordering::Relaxed,

)

.is_ok()

}

/// Atomically read the opcode at `index` with Acquire ordering.

/// Pairs with `replace_op` (Release) to ensure cache data visibility.

pub fn read_op(&self, index: usize) -> Instruction {

let units = unsafe { &*self.units.get() };

let ptr = units.as_ptr().wrapping_add(index) as *const AtomicU8;

let byte = unsafe { &*ptr }.load(Ordering::Acquire);

// SAFETY: Only valid Instruction values are stored via replace_op/compare_exchange_op.

unsafe { mem::transmute::<u8, Instruction>(byte) }

}

/// Atomically read the arg byte at `index` with Relaxed ordering.

pub fn read_arg(&self, index: usize) -> OpArgByte {

let units = unsafe { &*self.units.get() };

let ptr = units.as_ptr().wrapping_add(index) as *const u8;

let arg_ptr = unsafe { ptr.add(1) } as *const AtomicU8;

OpArgByte::from(unsafe { &*arg_ptr }.load(Ordering::Relaxed))

}

/// Write a u16 value into a CACHE code unit at `index`.

/// Each CodeUnit is 2 bytes (#[repr(C)]: op u8 + arg u8), so one u16 fits exactly.

/// Uses Relaxed atomic store; ordering is provided by replace_op (Release).

///

/// # Safety

/// - `index` must be in bounds and point to a CACHE entry.

pub unsafe fn write_cache_u16(&self, index: usize, value: u16) {

let units = unsafe { &*self.units.get() };

let ptr = units.as_ptr().wrapping_add(index) as *const AtomicU16;

unsafe { &*ptr }.store(value, Ordering::Relaxed);

}

/// Read a u16 value from a CACHE code unit at `index`.

/// Uses Relaxed atomic load; ordering is provided by read_op (Acquire).

///

/// # Panics

/// Panics if `index` is out of bounds.

pub fn read_cache_u16(&self, index: usize) -> u16 {

let units = unsafe { &*self.units.get() };

assert!(index < units.len(), "read_cache_u16: index out of bounds");

let ptr = units.as_ptr().wrapping_add(index) as *const AtomicU16;

unsafe { &*ptr }.load(Ordering::Relaxed)

}

/// Write a u32 value across two consecutive CACHE code units starting at `index`.

///

/// # Safety

/// Same requirements as `write_cache_u16`.

pub unsafe fn write_cache_u32(&self, index: usize, value: u32) {

unsafe {

self.write_cache_u16(index, value as u16);

self.write_cache_u16(index + 1, (value >> 16) as u16);

}

/// Read a u32 value from two consecutive CACHE code units starting at `index`.

///

/// # Panics

/// Panics if `index + 1` is out of bounds.

pub fn read_cache_u32(&self, index: usize) -> u32 {

let lo = self.read_cache_u16(index) as u32;

let hi = self.read_cache_u16(index + 1) as u32;

lo | (hi << 16)

}

/// Store a pointer-sized value atomically in the pointer cache at `index`.

///

/// Uses a single `AtomicUsize` store to prevent torn writes when

/// multiple threads specialize the same instruction concurrently.

///

/// # Safety

/// - `index` must be in bounds.

/// - `value` must be `0` or a valid `*const PyObject` encoded as `usize`.

/// - Callers must follow the cache invalidation/upgrade protocol:

/// invalidate the version guard before writing and publish the new

/// version after writing.

pub unsafe fn write_cache_ptr(&self, index: usize, value: usize) {

self.pointer_cache[index].store(value, Ordering::Relaxed);

}

/// Load a pointer-sized value atomically from the pointer cache at `index`.

///

/// Uses a single `AtomicUsize` load to prevent torn reads.

///

/// # Panics

/// Panics if `index` is out of bounds.

pub fn read_cache_ptr(&self, index: usize) -> usize {

self.pointer_cache[index].load(Ordering::Relaxed)

}

/// Read adaptive counter bits for instruction at `index`.

/// Uses Relaxed atomic load.

pub fn read_adaptive_counter(&self, index: usize) -> u16 {

self.adaptive_counters[index].load(Ordering::Relaxed)

}

/// Write adaptive counter bits for instruction at `index`.

/// Uses Relaxed atomic store.

///

/// # Safety

/// - `index` must be in bounds.

pub unsafe fn write_adaptive_counter(&self, index: usize, value: u16) {

self.adaptive_counters[index].store(value, Ordering::Relaxed);

}

/// Produce a clean copy of the bytecode suitable for serialization

/// (marshal) and `co_code`. Specialized opcodes are mapped back to their

/// base variants via `deoptimize()` and all CACHE entries are zeroed.

pub fn original_bytes(&self) -> Vec<u8> {

let len = self.len();

let mut out = Vec::with_capacity(len * 2);

let mut i = 0;

while i < len {

let op = self.read_op(i).deoptimize();

let arg = self.read_arg(i);

let caches = op.cache_entries();

out.push(u8::from(op));

out.push(u8::from(arg));

// Zero-fill all CACHE entries (counter + cached data)

for _ in 0..caches {

i += 1;

out.push(0); // op = Cache = 0

out.push(0); // arg = 0

}

i += 1;

}

out

}

/// Initialize adaptive warmup counters for all cacheable instructions.

/// Called lazily at RESUME (first execution of a code object).

/// Counters are stored out-of-line to preserve `op = Instruction::Cache`.

/// All writes are atomic (Relaxed) to avoid data races with concurrent readers.

pub fn quicken(&self) {

let len = self.len();

let mut i = 0;

while i < len {

let op = self.read_op(i);

let caches = op.cache_entries();

if caches > 0 {

// Don't write adaptive counter for instrumented opcodes;

// specialization is skipped while monitoring is active.

if !op.is_instrumented() {

let cache_base = i + 1;

if cache_base < len {

let initial_counter = if matches!(op, Instruction::JumpBackward { .. }) {

JUMP_BACKWARD_INITIAL_VALUE

} else {

ADAPTIVE_WARMUP_VALUE

};

unsafe {

self.write_adaptive_counter(cache_base, initial_counter);

}

i += 1 + caches;

} else {

i += 1;

}

/// A Constant (which usually encapsulates data within it)

///

/// # Examples

/// ```

/// use rustpython_compiler_core::bytecode::ConstantData;

/// let a = ConstantData::Float {value: 120f64};

/// let b = ConstantData::Boolean {value: false};

/// assert_ne!(a, b);

/// ```

#[derive(Debug, Clone)]

pub enum ConstantData {

Tuple { elements: Vec<ConstantData> },

Integer { value: BigInt },

Float { value: f64 },

Complex { value: Complex64 },

Boolean { value: bool },

Str { value: Wtf8Buf },

Bytes { value: Vec<u8> },

Code { code: Box<CodeObject> },

None,

Ellipsis,

}

impl PartialEq for ConstantData {

fn eq(&self, other: &Self) -> bool {

use ConstantData::*;

match (self, other) {

(Integer { value: a }, Integer { value: b }) => a == b,

// we want to compare floats *by actual value* - if we have the *exact same* float

// already in a constant cache, we want to use that

(Float { value: a }, Float { value: b }) => a.to_bits() == b.to_bits(),

(Complex { value: a }, Complex { value: b }) => {

a.re.to_bits() == b.re.to_bits() && a.im.to_bits() == b.im.to_bits()

}

(Boolean { value: a }, Boolean { value: b }) => a == b,

(Str { value: a }, Str { value: b }) => a == b,

(Bytes { value: a }, Bytes { value: b }) => a == b,

(Code { code: a }, Code { code: b }) => core::ptr::eq(a.as_ref(), b.as_ref()),

(Tuple { elements: a }, Tuple { elements: b }) => a == b,

(None, None) => true,

(Ellipsis, Ellipsis) => true,

_ => false,

}

impl Eq for ConstantData {}

impl hash::Hash for ConstantData {

fn hash<H: hash::Hasher>(&self, state: &mut H) {

use ConstantData::*;

mem::discriminant(self).hash(state);

match self {

Integer { value } => value.hash(state),

Float { value } => value.to_bits().hash(state),

Complex { value } => {

value.re.to_bits().hash(state);

value.im.to_bits().hash(state);

}

Boolean { value } => value.hash(state),

Str { value } => value.hash(state),

Bytes { value } => value.hash(state),

Code { code } => core::ptr::hash(code.as_ref(), state),

Tuple { elements } => elements.hash(state),

None => {}

Ellipsis => {}

}

/// A borrowed Constant

pub enum BorrowedConstant<'a, C: Constant> {

Integer { value: &'a BigInt },

Float { value: f64 },

Complex { value: Complex64 },

Boolean { value: bool },

Str { value: &'a Wtf8 },

Bytes { value: &'a [u8] },

Code { code: &'a CodeObject<C> },

Tuple { elements: &'a [C] },

None,

Ellipsis,

}

impl<C: Constant> Copy for BorrowedConstant<'_, C> {}

impl<C: Constant> Clone for BorrowedConstant<'_, C> {

fn clone(&self) -> Self {

*self

}

impl<C: Constant> BorrowedConstant<'_, C> {

pub fn fmt_display(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

match self {

BorrowedConstant::Integer { value } => write!(f, "{value}"),

BorrowedConstant::Float { value } => write!(f, "{value}"),

BorrowedConstant::Complex { value } => write!(f, "{value}"),

BorrowedConstant::Boolean { value } => {

write!(f, "{}", if *value { "True" } else { "False" })

}

BorrowedConstant::Str { value } => write!(f, "{value:?}"),

BorrowedConstant::Bytes { value } => write!(f, r#"b"{}""#, value.escape_ascii()),

BorrowedConstant::Code { code } => write!(f, "{code:?}"),

BorrowedConstant::Tuple { elements } => {

write!(f, "(")?;

let mut first = true;

for c in *elements {

if first {

first = false

} else {

write!(f, ", ")?;

}

c.borrow_constant().fmt_display(f)?;

}

write!(f, ")")

}

BorrowedConstant::None => write!(f, "None"),

BorrowedConstant::Ellipsis => write!(f, "..."),

}

pub fn to_owned(self) -> ConstantData {

use ConstantData::*;

match self {

BorrowedConstant::Integer { value } => Integer {

value: value.clone(),

BorrowedConstant::Float { value } => Float { value },

BorrowedConstant::Complex { value } => Complex { value },

BorrowedConstant::Boolean { value } => Boolean { value },

BorrowedConstant::Str { value } => Str {

value: value.to_owned(),

BorrowedConstant::Bytes { value } => Bytes {

value: value.to_owned(),

BorrowedConstant::Code { code } => Code {

code: Box::new(code.map_clone_bag(&BasicBag)),

BorrowedConstant::Tuple { elements } => Tuple {

elements: elements

.iter()

.map(|c| c.borrow_constant().to_owned())

.collect(),

BorrowedConstant::None => None,

BorrowedConstant::Ellipsis => Ellipsis,

}

Maintain a stack of blocks on the VM.

pub enum BlockType {

Loop,

Except,

}

/// Argument structure

pub struct Arguments<'a, N: AsRef<str>> {

pub posonlyargs: &'a [N],

pub args: &'a [N],

pub vararg: Option<&'a N>,

pub kwonlyargs: &'a [N],

pub varkwarg: Option<&'a N>,

}

impl<N: AsRef<str>> fmt::Debug for Arguments<'_, N> {

fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

macro_rules! fmt_slice {

($x:expr) => {

format_args!("[{}]", $x.iter().map(AsRef::as_ref).format(", "))

};

}

f.debug_struct("Arguments")

.field("posonlyargs", &fmt_slice!(self.posonlyargs))

.field("args", &fmt_slice!(self.posonlyargs))

.field("vararg", &self.vararg.map(N::as_ref))

.field("kwonlyargs", &fmt_slice!(self.kwonlyargs))

.field("varkwarg", &self.varkwarg.map(N::as_ref))

.finish()

}

impl<C: Constant> CodeObject<C> {

/// Get all arguments of the code object

/// like inspect.getargs

pub fn arg_names(&self) -> Arguments<'_, C::Name> {

let nargs = self.arg_count as usize;

let nkwargs = self.kwonlyarg_count as usize;

let mut varargs_pos = nargs + nkwargs;

let posonlyargs = &self.varnames[..self.posonlyarg_count as usize];

let args = &self.varnames[..nargs];

let kwonlyargs = &self.varnames[nargs..varargs_pos];

let vararg = if self.flags.contains(CodeFlags::VARARGS) {

let vararg = &self.varnames[varargs_pos];

varargs_pos += 1;

Some(vararg)

} else {

None

};

let varkwarg = if self.flags.contains(CodeFlags::VARKEYWORDS) {

Some(&self.varnames[varargs_pos])

} else {

None

};

Arguments {

posonlyargs,

args,

vararg,

kwonlyargs,

varkwarg,

}

/// Return the labels targeted by the instructions of this CodeObject

pub fn label_targets(&self) -> BTreeSet<Label> {

let mut label_targets = BTreeSet::new();

let mut arg_state = OpArgState::default();

for instruction in &*self.instructions {

let (instruction, arg) = arg_state.get(*instruction);

if let Some(l) = instruction.label_arg() {

label_targets.insert(l.get(arg));

}

label_targets

}

fn display_inner(

&self,

f: &mut fmt::Formatter<'_>,

expand_code_objects: bool,

level: usize,

) -> fmt::Result {

let label_targets = self.label_targets();

let line_digits = (3).max(self.locations.last().unwrap().0.line.digits().get());

View remainder of file in raw view

FilesExpand file tree

bytecode.rs

Latest commit

History

bytecode.rs

File metadata and controls