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mod.rs
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//! Intermediate representation for instructions.
//!
//! The goal is to match wasm instructions as closely as possible, but translate
//! the stack machine into an instruction tree. Additionally all control frames
//! are representd as `Block`s.
mod traversals;
pub use self::traversals::*;
use crate::encode::Encoder;
use crate::{
DataId, FunctionId, GlobalId, LocalFunction, MemoryId, ModuleTypes, TableId, TypeId, ValType,
};
use id_arena::Id;
use std::fmt;
use std::ops::{Deref, DerefMut};
use walrus_macro::walrus_instr;
/// The id of a local.
pub type LocalId = Id<Local>;
/// A local variable or parameter.
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct Local {
id: LocalId,
ty: ValType,
/// A human-readable name for this local, often useful when debugging
pub name: Option<String>,
}
impl Local {
/// Construct a new local from the given id and type.
pub fn new(id: LocalId, ty: ValType) -> Local {
Local { id, ty, name: None }
}
/// Get this local's id that is unique across the whole module.
pub fn id(&self) -> LocalId {
self.id
}
/// Get this local's type.
pub fn ty(&self) -> ValType {
self.ty
}
}
/// The identifier for a `InstrSeq` within some `LocalFunction`.
pub type InstrSeqId = Id<InstrSeq>;
/// The type of an instruction sequence.
///
// NB: We purposefully match the encoding for block types here, with MVP Wasm
// types inlined and multi-value types outlined. If we tried to simplify this
// type representation by always using `TypeId`, then the `used` pass would
// think that a bunch of types that are only internally used by `InstrSeq`s are
// generally used, and we would emit them in the module's "Types" section. We
// don't want to bloat the modules we emit, nor do we want to make the used/GC
// passes convoluted, so we intentionally let the shape of this type guide us.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum InstrSeqType {
/// MVP Wasm blocks/loops/ifs can only push zero or one resulting value onto
/// the stack. They cannot take parameters on the stack.
Simple(Option<ValType>),
/// The multi-value extension to Wasm allows arbitrary stack parameters and
/// results, which are expressed via the same mechanism as function types.
MultiValue(TypeId),
}
impl InstrSeqType {
/// Construct a new `InstrSeqType` of the correct form for the given
/// parameter and result types.
pub fn new(types: &mut ModuleTypes, params: &[ValType], results: &[ValType]) -> InstrSeqType {
match (params.len(), results.len()) {
(0, 0) => InstrSeqType::Simple(None),
(0, 1) => InstrSeqType::Simple(Some(results[0])),
_ => InstrSeqType::MultiValue(types.add(params, results)),
}
}
/// Construct an `InstrSeqType` with a signature that is known to either be
/// `Simple` or uses a `Type` that has already been inserted into the
/// `ModuleTypes`.
///
/// Returns `None` if this is an instruction sequence signature that
/// requires multi-value and `ModuleTypes` does not already have a `Type`
/// for it.
pub fn existing(
types: &ModuleTypes,
params: &[ValType],
results: &[ValType],
) -> Option<InstrSeqType> {
Some(match (params.len(), results.len()) {
(0, 0) => InstrSeqType::Simple(None),
(0, 1) => InstrSeqType::Simple(Some(results[0])),
_ => InstrSeqType::MultiValue(types.find(params, results)?),
})
}
}
impl From<Option<ValType>> for InstrSeqType {
#[inline]
fn from(x: Option<ValType>) -> InstrSeqType {
InstrSeqType::Simple(x)
}
}
impl From<ValType> for InstrSeqType {
#[inline]
fn from(x: ValType) -> InstrSeqType {
InstrSeqType::Simple(Some(x))
}
}
impl From<TypeId> for InstrSeqType {
#[inline]
fn from(x: TypeId) -> InstrSeqType {
InstrSeqType::MultiValue(x)
}
}
/// A symbolic original wasm operator source location.
#[derive(Debug, Copy, Clone)]
pub struct InstrLocId(u32);
const DEFAULT_INSTR_LOC_ID: u32 = 0xffff_ffff;
impl InstrLocId {
/// Create `InstrLocId` from provided data. Normaly the data is
/// wasm bytecode offset. (0xffff_ffff is reserved for default value).
pub fn new(data: u32) -> Self {
assert!(data != DEFAULT_INSTR_LOC_ID);
InstrLocId(data)
}
/// Check if default value.
pub fn is_default(&self) -> bool {
self.0 == DEFAULT_INSTR_LOC_ID
}
/// The data
pub fn data(&self) -> u32 {
assert!(self.0 != DEFAULT_INSTR_LOC_ID);
self.0
}
}
impl Default for InstrLocId {
fn default() -> Self {
InstrLocId(DEFAULT_INSTR_LOC_ID)
}
}
/// A sequence of instructions.
#[derive(Debug)]
pub struct InstrSeq {
id: InstrSeqId,
/// This block's type: its the types of values that are expected on the
/// stack when entering this instruction sequence and the types that are
/// left on the stack afterwards.
pub ty: InstrSeqType,
/// The instructions that make up the body of this block.
pub instrs: Vec<(Instr, InstrLocId)>,
}
impl Deref for InstrSeq {
type Target = Vec<(Instr, InstrLocId)>;
#[inline]
fn deref(&self) -> &Vec<(Instr, InstrLocId)> {
&self.instrs
}
}
impl DerefMut for InstrSeq {
#[inline]
fn deref_mut(&mut self) -> &mut Vec<(Instr, InstrLocId)> {
&mut self.instrs
}
}
impl InstrSeq {
/// Construct a new instruction sequence.
pub(crate) fn new(id: InstrSeqId, ty: InstrSeqType) -> InstrSeq {
let instrs = vec![];
InstrSeq { id, ty, instrs }
}
/// Get the id of this instruction sequence.
#[inline]
pub fn id(&self) -> InstrSeqId {
self.id
}
}
/// Different kinds of blocks.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub(crate) enum BlockKind {
/// A `block` block.
Block,
/// A `loop` block.
Loop,
/// An `if` block
If,
/// An `Else` block
Else,
/// The entry to a function.
FunctionEntry,
}
/// An enum of all the different kinds of wasm instructions.
///
/// Note that the `#[walrus_expr]` macro rewrites this enum's variants from
///
/// ```ignore
/// enum Instr {
/// Variant { field: Ty, .. },
/// ...
/// }
/// ```
///
/// into
///
/// ```ignore
/// enum Instr {
/// Variant(Variant),
/// ...
/// }
///
/// struct Variant {
/// field: Ty,
/// ...
/// }
/// ```
#[walrus_instr]
#[derive(Clone, Debug)]
pub enum Instr {
/// `block ... end`
#[walrus(skip_builder)]
Block {
/// The id of this `block` instruction's inner `InstrSeq`.
seq: InstrSeqId,
},
/// `loop ... end`
#[walrus(skip_builder)]
Loop {
/// The id of this `loop` instruction's inner `InstrSeq`.
seq: InstrSeqId,
},
/// `call`
Call {
/// The function being invoked.
func: FunctionId,
},
/// `call_indirect`
CallIndirect {
/// The type signature of the function we're calling
ty: TypeId,
/// The table which `func` below is indexing into
table: TableId,
},
/// `local.get n`
LocalGet {
/// The local being got.
local: LocalId,
},
/// `local.set n`
LocalSet {
/// The local being set.
local: LocalId,
},
/// `local.tee n`
LocalTee {
/// The local being set.
local: LocalId,
},
/// `global.get n`
GlobalGet {
/// The global being got.
global: GlobalId,
},
/// `global.set n`
GlobalSet {
/// The global being set.
global: GlobalId,
},
/// `*.const`
Const {
/// The constant value.
value: Value,
},
/// Binary operations, those requiring two operands
Binop {
/// The operation being performed
#[walrus(skip_visit)]
op: BinaryOp,
},
/// Unary operations, those requiring one operand
Unop {
/// The operation being performed
#[walrus(skip_visit)]
op: UnaryOp,
},
/// `select`
Select {},
/// `unreachable`
Unreachable {},
/// `br`
Br {
/// The target block to branch to.
#[walrus(skip_visit)] // should have already been visited
block: InstrSeqId,
},
/// `br_if`
BrIf {
/// The target block to branch to when the condition is met.
#[walrus(skip_visit)] // should have already been visited
block: InstrSeqId,
},
/// `if <consequent> else <alternative> end`
#[walrus(skip_builder)]
IfElse {
/// The block to execute when the condition is true.
consequent: InstrSeqId,
/// The block to execute when the condition is false.
alternative: InstrSeqId,
},
/// `br_table`
BrTable {
/// The table of target blocks.
#[walrus(skip_visit)] // should have already been visited
blocks: Box<[InstrSeqId]>,
/// The block that is branched to by default when `which` is out of the
/// table's bounds.
#[walrus(skip_visit)] // should have already been visited
default: InstrSeqId,
},
/// `drop`
Drop {},
/// `return`
Return {},
/// `memory.size`
MemorySize {
/// The memory we're fetching the current size of.
memory: MemoryId,
},
/// `memory.grow`
MemoryGrow {
/// The memory we're growing.
memory: MemoryId,
},
/// `memory.init`
MemoryInit {
/// The memory we're growing.
memory: MemoryId,
/// The data to copy in
data: DataId,
},
/// `data.drop`
DataDrop {
/// The data to drop
data: DataId,
},
/// `memory.copy`
MemoryCopy {
/// The source memory
src: MemoryId,
/// The destination memory
dst: MemoryId,
},
/// `memory.fill`
MemoryFill {
/// The memory to fill
memory: MemoryId,
},
/// `*.load`
///
/// Loading a value from memory.
Load {
/// The memory we're loading from.
memory: MemoryId,
/// The kind of memory load this is performing
#[walrus(skip_visit)]
kind: LoadKind,
/// The alignment and offset of this memory load
#[walrus(skip_visit)]
arg: MemArg,
},
/// `*.store`
///
/// Storing a value to memory.
Store {
/// The memory we're storing to
memory: MemoryId,
/// The kind of memory store this is performing
#[walrus(skip_visit)]
kind: StoreKind,
/// The alignment and offset of this memory store
#[walrus(skip_visit)]
arg: MemArg,
},
/// An atomic read/modify/write operation.
AtomicRmw {
/// The memory we're modifying
memory: MemoryId,
/// The atomic operation being performed
#[walrus(skip_visit)]
op: AtomicOp,
/// The atomic operation being performed
#[walrus(skip_visit)]
width: AtomicWidth,
/// The alignment and offset from the base address
#[walrus(skip_visit)]
arg: MemArg,
},
/// An atomic compare-and-exchange operation.
Cmpxchg {
/// The memory we're modifying
memory: MemoryId,
/// The atomic operation being performed
#[walrus(skip_visit)]
width: AtomicWidth,
/// The alignment and offset from the base address
#[walrus(skip_visit)]
arg: MemArg,
},
/// The `atomic.notify` instruction to wake up threads.
AtomicNotify {
/// The memory we're notifying through
memory: MemoryId,
/// The alignment and offset from the base address
#[walrus(skip_visit)]
arg: MemArg,
},
/// The `*.atomic.wait` instruction to block threads.
AtomicWait {
/// The memory we're waiting through.
memory: MemoryId,
/// The alignment and offset from the base address.
#[walrus(skip_visit)]
arg: MemArg,
/// Whether or not this is an `i32` or `i64` wait.
#[walrus(skip_visit)]
sixty_four: bool,
},
/// The `atomic.fence` instruction
AtomicFence {},
/// `table.get`
TableGet {
/// The table we're fetching from.
table: TableId,
},
/// `table.set`
TableSet {
/// The table we're storing to.
table: TableId,
},
/// `table.grow`
TableGrow {
/// The table we're growing
table: TableId,
},
/// `table.size`
TableSize {
/// The table we're getting the size of
table: TableId,
},
/// `table.fill`
TableFill {
/// The table we're filling
table: TableId,
},
/// `ref.null`
RefNull {},
/// `ref.is_null`
RefIsNull {},
/// `ref.func`
RefFunc {
/// The function that this instruction is referencing
func: FunctionId,
},
/// `v128.bitselect`
V128Bitselect {},
/// `v128.swizzle`
V128Swizzle {},
/// `v128.shuffle`
V128Shuffle {
/// The indices that are used to create the final vector of this
/// instruction
#[walrus(skip_visit)]
indices: ShuffleIndices,
},
/// `iaaxbb.load_splat`
LoadSplat {
/// The memory we're loading from.
memory: MemoryId,
/// The size of load this is performing
#[walrus(skip_visit)]
kind: LoadSplatKind,
/// The alignment and offset of this memory load
#[walrus(skip_visit)]
arg: MemArg,
},
}
/// Argument in `V128Shuffle` of lane indices to select
pub type ShuffleIndices = [u8; 16];
/// Constant values that can show up in WebAssembly
#[derive(Debug, Clone, Copy)]
pub enum Value {
/// A constant 32-bit integer
I32(i32),
/// A constant 64-bit integer
I64(i64),
/// A constant 32-bit float
F32(f32),
/// A constant 64-bit float
F64(f64),
/// A constant 128-bit vector register
V128(u128),
}
impl Value {
pub(crate) fn emit(&self, encoder: &mut Encoder) {
match *self {
Value::I32(n) => {
encoder.byte(0x41); // i32.const
encoder.i32(n);
}
Value::I64(n) => {
encoder.byte(0x42); // i64.const
encoder.i64(n);
}
Value::F32(n) => {
encoder.byte(0x43); // f32.const
encoder.f32(n);
}
Value::F64(n) => {
encoder.byte(0x44); // f64.const
encoder.f64(n);
}
Value::V128(n) => {
encoder.raw(&[0xfd, 0x02]); // v128.const
for i in 0..16 {
encoder.byte((n >> (i * 8)) as u8);
}
}
}
}
}
impl fmt::Display for Value {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Value::I32(i) => i.fmt(f),
Value::I64(i) => i.fmt(f),
Value::F32(i) => i.fmt(f),
Value::F64(i) => i.fmt(f),
Value::V128(i) => i.fmt(f),
}
}
}
/// Possible binary operations in wasm
#[allow(missing_docs)]
#[derive(Copy, Clone, Debug)]
pub enum BinaryOp {
I32Eq,
I32Ne,
I32LtS,
I32LtU,
I32GtS,
I32GtU,
I32LeS,
I32LeU,
I32GeS,
I32GeU,
I64Eq,
I64Ne,
I64LtS,
I64LtU,
I64GtS,
I64GtU,
I64LeS,
I64LeU,
I64GeS,
I64GeU,
F32Eq,
F32Ne,
F32Lt,
F32Gt,
F32Le,
F32Ge,
F64Eq,
F64Ne,
F64Lt,
F64Gt,
F64Le,
F64Ge,
I32Add,
I32Sub,
I32Mul,
I32DivS,
I32DivU,
I32RemS,
I32RemU,
I32And,
I32Or,
I32Xor,
I32Shl,
I32ShrS,
I32ShrU,
I32Rotl,
I32Rotr,
I64Add,
I64Sub,
I64Mul,
I64DivS,
I64DivU,
I64RemS,
I64RemU,
I64And,
I64Or,
I64Xor,
I64Shl,
I64ShrS,
I64ShrU,
I64Rotl,
I64Rotr,
F32Add,
F32Sub,
F32Mul,
F32Div,
F32Min,
F32Max,
F32Copysign,
F64Add,
F64Sub,
F64Mul,
F64Div,
F64Min,
F64Max,
F64Copysign,
I8x16ReplaceLane { idx: u8 },
I16x8ReplaceLane { idx: u8 },
I32x4ReplaceLane { idx: u8 },
I64x2ReplaceLane { idx: u8 },
F32x4ReplaceLane { idx: u8 },
F64x2ReplaceLane { idx: u8 },
I8x16Eq,
I8x16Ne,
I8x16LtS,
I8x16LtU,
I8x16GtS,
I8x16GtU,
I8x16LeS,
I8x16LeU,
I8x16GeS,
I8x16GeU,
I16x8Eq,
I16x8Ne,
I16x8LtS,
I16x8LtU,
I16x8GtS,
I16x8GtU,
I16x8LeS,
I16x8LeU,
I16x8GeS,
I16x8GeU,
I32x4Eq,
I32x4Ne,
I32x4LtS,
I32x4LtU,
I32x4GtS,
I32x4GtU,
I32x4LeS,
I32x4LeU,
I32x4GeS,
I32x4GeU,
F32x4Eq,
F32x4Ne,
F32x4Lt,
F32x4Gt,
F32x4Le,
F32x4Ge,
F64x2Eq,
F64x2Ne,
F64x2Lt,
F64x2Gt,
F64x2Le,
F64x2Ge,
V128And,
V128Or,
V128Xor,
I8x16Shl,
I8x16ShrS,
I8x16ShrU,
I8x16Add,
I8x16AddSaturateS,
I8x16AddSaturateU,
I8x16Sub,
I8x16SubSaturateS,
I8x16SubSaturateU,
I8x16Mul,
I16x8Shl,
I16x8ShrS,
I16x8ShrU,
I16x8Add,
I16x8AddSaturateS,
I16x8AddSaturateU,
I16x8Sub,
I16x8SubSaturateS,
I16x8SubSaturateU,
I16x8Mul,
I32x4Shl,
I32x4ShrS,
I32x4ShrU,
I32x4Add,
I32x4Sub,
I32x4Mul,
I64x2Shl,
I64x2ShrS,
I64x2ShrU,
I64x2Add,
I64x2Sub,
F32x4Add,
F32x4Sub,
F32x4Mul,
F32x4Div,
F32x4Min,
F32x4Max,
F64x2Add,
F64x2Sub,
F64x2Mul,
F64x2Div,
F64x2Min,
F64x2Max,
}
/// Possible unary operations in wasm
#[allow(missing_docs)]
#[derive(Copy, Clone, Debug)]
pub enum UnaryOp {
I32Eqz,
I32Clz,
I32Ctz,
I32Popcnt,
I64Eqz,
I64Clz,
I64Ctz,
I64Popcnt,
F32Abs,
F32Neg,
F32Ceil,
F32Floor,
F32Trunc,
F32Nearest,
F32Sqrt,
F64Abs,
F64Neg,
F64Ceil,
F64Floor,
F64Trunc,
F64Nearest,
F64Sqrt,
I32WrapI64,
I32TruncSF32,
I32TruncUF32,
I32TruncSF64,
I32TruncUF64,
I64ExtendSI32,
I64ExtendUI32,
I64TruncSF32,
I64TruncUF32,
I64TruncSF64,
I64TruncUF64,
F32ConvertSI32,
F32ConvertUI32,
F32ConvertSI64,
F32ConvertUI64,
F32DemoteF64,
F64ConvertSI32,
F64ConvertUI32,
F64ConvertSI64,
F64ConvertUI64,
F64PromoteF32,
I32ReinterpretF32,
I64ReinterpretF64,
F32ReinterpretI32,
F64ReinterpretI64,
I32Extend8S,
I32Extend16S,
I64Extend8S,
I64Extend16S,
I64Extend32S,
I8x16Splat,
I8x16ExtractLaneS { idx: u8 },
I8x16ExtractLaneU { idx: u8 },
I16x8Splat,
I16x8ExtractLaneS { idx: u8 },
I16x8ExtractLaneU { idx: u8 },
I32x4Splat,
I32x4ExtractLane { idx: u8 },
I64x2Splat,
I64x2ExtractLane { idx: u8 },
F32x4Splat,
F32x4ExtractLane { idx: u8 },
F64x2Splat,
F64x2ExtractLane { idx: u8 },
V128Not,
I8x16Neg,
I8x16AnyTrue,
I8x16AllTrue,
I16x8Neg,
I16x8AnyTrue,
I16x8AllTrue,
I32x4Neg,
I32x4AnyTrue,
I32x4AllTrue,
I64x2Neg,
I64x2AnyTrue,
I64x2AllTrue,
F32x4Abs,
F32x4Neg,
F32x4Sqrt,
F64x2Abs,
F64x2Neg,
F64x2Sqrt,
I32x4TruncSF32x4Sat,
I32x4TruncUF32x4Sat,
I64x2TruncSF64x2Sat,
I64x2TruncUF64x2Sat,
F32x4ConvertSI32x4,
F32x4ConvertUI32x4,
F64x2ConvertSI64x2,
F64x2ConvertUI64x2,
I32TruncSSatF32,
I32TruncUSatF32,
I32TruncSSatF64,
I32TruncUSatF64,
I64TruncSSatF32,
I64TruncUSatF32,
I64TruncSSatF64,
I64TruncUSatF64,
}
/// The different kinds of load instructions that are part of a `Load` IR node
#[derive(Debug, Copy, Clone)]
#[allow(missing_docs)]
pub enum LoadKind {
// TODO: much of this is probably redundant with type information already
// ambiently available, we probably want to trim this down to just "value"
// and then maybe some sign extensions. We'd then use the type of the node
// to figure out what kind of store it actually is.
I32 { atomic: bool },
I64 { atomic: bool },
F32,
F64,
V128,
I32_8 { kind: ExtendedLoad },
I32_16 { kind: ExtendedLoad },
I64_8 { kind: ExtendedLoad },
I64_16 { kind: ExtendedLoad },
I64_32 { kind: ExtendedLoad },
}
/// The different kinds of load instructions that are part of a `LoadSplat` IR node
#[derive(Debug, Copy, Clone)]
#[allow(missing_docs)]
pub enum LoadSplatKind {
I8,
I16,
I32,
I64,
}
/// The kinds of extended loads which can happen
#[derive(Debug, Copy, Clone)]
#[allow(missing_docs)]
pub enum ExtendedLoad {
SignExtend,
ZeroExtend,
ZeroExtendAtomic,
}
impl LoadKind {
/// Returns the number of bytes loaded
pub fn width(&self) -> u32 {
use self::LoadKind::*;
match self {
I32_8 { .. } | I64_8 { .. } => 1,
I32_16 { .. } | I64_16 { .. } => 2,
I32 { .. } | F32 | I64_32 { .. } => 4,
I64 { .. } | F64 => 8,
V128 => 16,
}
}
/// Returns if this is an atomic load
pub fn atomic(&self) -> bool {
use self::LoadKind::*;
match self {
I32_8 { kind }
| I32_16 { kind }
| I64_8 { kind }
| I64_16 { kind }
| I64_32 { kind } => kind.atomic(),
I32 { atomic } | I64 { atomic } => *atomic,
F32 | F64 | V128 => false,
}
}
}
impl ExtendedLoad {
/// Returns whether this is an atomic extended load
pub fn atomic(&self) -> bool {
match self {
ExtendedLoad::SignExtend | ExtendedLoad::ZeroExtend => false,
ExtendedLoad::ZeroExtendAtomic => true,
}