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wasmtime/src/backend.rs

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use crate::error::Error;
use crate::microwasm::{BrTarget, SignlessType, Type, Value, F32, F64, I32, I64};
use crate::module::ModuleContext;
use cranelift_codegen::{binemit, ir};
use dynasm::dynasm;
use dynasmrt::x64::Assembler;
use dynasmrt::{AssemblyOffset, DynamicLabel, DynasmApi, DynasmLabelApi, ExecutableBuffer};
use either::Either;
use std::{
any::{Any, TypeId},
collections::HashMap,
iter::{self, FromIterator},
mem,
ops::RangeInclusive,
};
use self::registers::*;
// TODO: Get rid of this! It's a total hack.
mod magic {
use cranelift_codegen::ir;
/// Compute an `ir::ExternalName` for the `memory.grow` libcall for
/// 32-bit locally-defined memories.
pub fn get_memory32_grow_name() -> ir::ExternalName {
ir::ExternalName::user(1, 0)
}
/// Compute an `ir::ExternalName` for the `memory.grow` libcall for
/// 32-bit imported memories.
pub fn get_imported_memory32_grow_name() -> ir::ExternalName {
ir::ExternalName::user(1, 1)
}
/// Compute an `ir::ExternalName` for the `memory.size` libcall for
/// 32-bit locally-defined memories.
pub fn get_memory32_size_name() -> ir::ExternalName {
ir::ExternalName::user(1, 2)
}
/// Compute an `ir::ExternalName` for the `memory.size` libcall for
/// 32-bit imported memories.
pub fn get_imported_memory32_size_name() -> ir::ExternalName {
ir::ExternalName::user(1, 3)
}
}
/// Size of a pointer on the target in bytes.
const WORD_SIZE: u32 = 8;
type RegId = u8;
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub enum GPR {
Rq(RegId),
Rx(RegId),
}
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub enum GPRType {
Rq,
Rx,
}
impl From<SignlessType> for GPRType {
fn from(other: SignlessType) -> GPRType {
match other {
I32 | I64 => GPRType::Rq,
F32 | F64 => GPRType::Rx,
}
}
}
impl From<SignlessType> for Option<GPRType> {
fn from(other: SignlessType) -> Self {
Some(other.into())
}
}
impl GPR {
fn type_(self) -> GPRType {
match self {
GPR::Rq(_) => GPRType::Rq,
GPR::Rx(_) => GPRType::Rx,
}
}
fn rq(self) -> Option<RegId> {
match self {
GPR::Rq(r) => Some(r),
GPR::Rx(_) => None,
}
}
fn rx(self) -> Option<RegId> {
match self {
GPR::Rx(r) => Some(r),
GPR::Rq(_) => None,
}
}
}
pub fn arg_locs(types: impl IntoIterator<Item = SignlessType>) -> Vec<CCLoc> {
let types = types.into_iter();
let mut out = Vec::with_capacity(types.size_hint().0);
// TODO: VmCtx is in the first register
let mut int_gpr_iter = INTEGER_ARGS_IN_GPRS.iter();
let mut float_gpr_iter = FLOAT_ARGS_IN_GPRS.iter();
let mut stack_idx = 0;
for ty in types {
match ty {
I32 | I64 => out.push(int_gpr_iter.next().map(|&r| CCLoc::Reg(r)).unwrap_or_else(
|| {
let out = CCLoc::Stack(stack_idx);
stack_idx += 1;
out
},
)),
F32 | F64 => out.push(
float_gpr_iter
.next()
.map(|&r| CCLoc::Reg(r))
.expect("Float args on stack not yet supported"),
),
}
}
out
}
pub fn ret_locs(types: impl IntoIterator<Item = SignlessType>) -> Vec<CCLoc> {
let types = types.into_iter();
let mut out = Vec::with_capacity(types.size_hint().0);
// TODO: VmCtx is in the first register
let mut int_gpr_iter = INTEGER_RETURN_GPRS.iter();
let mut float_gpr_iter = FLOAT_RETURN_GPRS.iter();
for ty in types {
match ty {
I32 | I64 => out.push(CCLoc::Reg(
*int_gpr_iter
.next()
.expect("We don't support stack returns yet"),
)),
F32 | F64 => out.push(CCLoc::Reg(
*float_gpr_iter
.next()
.expect("We don't support stack returns yet"),
)),
}
}
out
}
#[derive(Debug, Copy, Clone)]
struct GPRs {
bits: u16,
}
impl GPRs {
fn new() -> Self {
Self { bits: 0 }
}
}
#[allow(dead_code)]
pub mod registers {
use super::{RegId, GPR};
pub mod rq {
use super::RegId;
pub const RAX: RegId = 0;
pub const RCX: RegId = 1;
pub const RDX: RegId = 2;
pub const RBX: RegId = 3;
pub const RSP: RegId = 4;
pub const RBP: RegId = 5;
pub const RSI: RegId = 6;
pub const RDI: RegId = 7;
pub const R8: RegId = 8;
pub const R9: RegId = 9;
pub const R10: RegId = 10;
pub const R11: RegId = 11;
pub const R12: RegId = 12;
pub const R13: RegId = 13;
pub const R14: RegId = 14;
pub const R15: RegId = 15;
}
pub const RAX: GPR = GPR::Rq(self::rq::RAX);
pub const RCX: GPR = GPR::Rq(self::rq::RCX);
pub const RDX: GPR = GPR::Rq(self::rq::RDX);
pub const RBX: GPR = GPR::Rq(self::rq::RBX);
pub const RSP: GPR = GPR::Rq(self::rq::RSP);
pub const RBP: GPR = GPR::Rq(self::rq::RBP);
pub const RSI: GPR = GPR::Rq(self::rq::RSI);
pub const RDI: GPR = GPR::Rq(self::rq::RDI);
pub const R8: GPR = GPR::Rq(self::rq::R8);
pub const R9: GPR = GPR::Rq(self::rq::R9);
pub const R10: GPR = GPR::Rq(self::rq::R10);
pub const R11: GPR = GPR::Rq(self::rq::R11);
pub const R12: GPR = GPR::Rq(self::rq::R12);
pub const R13: GPR = GPR::Rq(self::rq::R13);
pub const R14: GPR = GPR::Rq(self::rq::R14);
pub const R15: GPR = GPR::Rq(self::rq::R15);
pub const XMM0: GPR = GPR::Rx(0);
pub const XMM1: GPR = GPR::Rx(1);
pub const XMM2: GPR = GPR::Rx(2);
pub const XMM3: GPR = GPR::Rx(3);
pub const XMM4: GPR = GPR::Rx(4);
pub const XMM5: GPR = GPR::Rx(5);
pub const XMM6: GPR = GPR::Rx(6);
pub const XMM7: GPR = GPR::Rx(7);
pub const XMM8: GPR = GPR::Rx(8);
pub const XMM9: GPR = GPR::Rx(9);
pub const XMM10: GPR = GPR::Rx(10);
pub const XMM11: GPR = GPR::Rx(11);
pub const XMM12: GPR = GPR::Rx(12);
pub const XMM13: GPR = GPR::Rx(13);
pub const XMM14: GPR = GPR::Rx(14);
pub const XMM15: GPR = GPR::Rx(15);
pub const NUM_GPRS: u8 = 16;
}
const SIGN_MASK_F64: u64 = 0b1000000000000000000000000000000000000000000000000000000000000000;
const REST_MASK_F64: u64 = !SIGN_MASK_F64;
const SIGN_MASK_F32: u32 = 0b10000000000000000000000000000000;
const REST_MASK_F32: u32 = !SIGN_MASK_F32;
impl GPRs {
fn take(&mut self) -> Option<RegId> {
let lz = self.bits.trailing_zeros();
if lz < 16 {
let gpr = lz as RegId;
self.mark_used(gpr);
Some(gpr)
} else {
None
}
}
fn mark_used(&mut self, gpr: RegId) {
self.bits &= !(1 << gpr as u16);
}
fn release(&mut self, gpr: RegId) {
debug_assert!(
!self.is_free(gpr),
"released register {} was already free",
gpr
);
self.bits |= 1 << gpr;
}
fn is_free(&self, gpr: RegId) -> bool {
(self.bits & (1 << gpr)) != 0
}
}
#[derive(Debug, Copy, Clone)]
pub struct Registers {
/// Registers at 64 bits and below (al/ah/ax/eax/rax, for example)
scratch_64: (GPRs, [u8; NUM_GPRS as usize]),
/// Registers at 128 bits (xmm0, for example)
scratch_128: (GPRs, [u8; NUM_GPRS as usize]),
}
impl Default for Registers {
fn default() -> Self {
Self::new()
}
}
impl Registers {
pub fn new() -> Self {
let mut result = Self {
scratch_64: (GPRs::new(), [1; NUM_GPRS as _]),
scratch_128: (GPRs::new(), [1; NUM_GPRS as _]),
};
// Give ourselves a few scratch registers to work with, for now.
for &scratch in SCRATCH_REGS {
result.release(scratch);
}
result
}
fn scratch_counts_mut(&mut self, gpr: GPR) -> (u8, &mut (GPRs, [u8; NUM_GPRS as usize])) {
match gpr {
GPR::Rq(r) => (r, &mut self.scratch_64),
GPR::Rx(r) => (r, &mut self.scratch_128),
}
}
fn scratch_counts(&self, gpr: GPR) -> (u8, &(GPRs, [u8; NUM_GPRS as usize])) {
match gpr {
GPR::Rq(r) => (r, &self.scratch_64),
GPR::Rx(r) => (r, &self.scratch_128),
}
}
pub fn mark_used(&mut self, gpr: GPR) {
let (gpr, scratch_counts) = self.scratch_counts_mut(gpr);
scratch_counts.0.mark_used(gpr);
scratch_counts.1[gpr as usize] += 1;
}
pub fn num_usages(&self, gpr: GPR) -> u8 {
let (gpr, scratch_counts) = self.scratch_counts(gpr);
scratch_counts.1[gpr as usize]
}
pub fn take(&mut self, ty: impl Into<GPRType>) -> Option<GPR> {
let (mk_gpr, scratch_counts) = match ty.into() {
GPRType::Rq => (GPR::Rq as fn(_) -> _, &mut self.scratch_64),
GPRType::Rx => (GPR::Rx as fn(_) -> _, &mut self.scratch_128),
};
let out = scratch_counts.0.take()?;
scratch_counts.1[out as usize] += 1;
Some(mk_gpr(out))
}
pub fn release(&mut self, gpr: GPR) {
let (gpr, scratch_counts) = self.scratch_counts_mut(gpr);
let c = &mut scratch_counts.1[gpr as usize];
*c -= 1;
if *c == 0 {
scratch_counts.0.release(gpr);
}
}
pub fn is_free(&self, gpr: GPR) -> bool {
let (gpr, scratch_counts) = self.scratch_counts(gpr);
scratch_counts.0.is_free(gpr)
}
}
#[derive(Debug, Clone)]
pub struct BlockCallingConvention {
pub stack_depth: StackDepth,
pub arguments: Vec<CCLoc>,
}
impl BlockCallingConvention {
pub fn function_start(args: impl IntoIterator<Item = CCLoc>) -> Self {
BlockCallingConvention {
// We start and return the function with stack depth 1 since we must
// allow space for the saved return address.
stack_depth: StackDepth(1),
arguments: Vec::from_iter(args),
}
}
}
// TODO: Combine this with `ValueLocation`?
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum CCLoc {
/// Value exists in a register.
Reg(GPR),
/// Value exists on the stack.
Stack(i32),
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum CondCode {
CF0,
CF1,
ZF0,
ZF1,
CF0AndZF0,
CF1OrZF1,
ZF0AndSFEqOF,
ZF1OrSFNeOF,
SFEqOF,
SFNeOF,
}
mod cc {
use super::CondCode;
pub const EQUAL: CondCode = CondCode::ZF0;
pub const NOT_EQUAL: CondCode = CondCode::ZF1;
pub const GE_U: CondCode = CondCode::CF0;
pub const LT_U: CondCode = CondCode::CF1;
pub const GT_U: CondCode = CondCode::CF0AndZF0;
pub const LE_U: CondCode = CondCode::CF1OrZF1;
pub const GE_S: CondCode = CondCode::SFEqOF;
pub const LT_S: CondCode = CondCode::SFNeOF;
pub const GT_S: CondCode = CondCode::ZF0AndSFEqOF;
pub const LE_S: CondCode = CondCode::ZF1OrSFNeOF;
}
impl std::ops::Not for CondCode {
type Output = Self;
fn not(self) -> Self {
use CondCode::*;
match self {
CF0 => CF1,
CF1 => CF0,
ZF0 => ZF1,
ZF1 => ZF0,
CF0AndZF0 => CF1OrZF1,
CF1OrZF1 => CF0AndZF0,
ZF0AndSFEqOF => ZF1OrSFNeOF,
ZF1OrSFNeOF => ZF0AndSFEqOF,
SFEqOF => SFNeOF,
SFNeOF => SFEqOF,
}
}
}
// TODO: Allow pushing condition codes to stack? We'd have to immediately
// materialise them into a register if anything is pushed above them.
/// Describes location of a value.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum ValueLocation {
/// Value exists in a register.
Reg(GPR),
/// Value exists on the stack. Note that this offset is from the rsp as it
/// was when we entered the function.
Stack(i32),
/// Value is a literal
Immediate(Value),
/// Value is a set condition code
Cond(CondCode),
}
impl From<CCLoc> for ValueLocation {
fn from(other: CCLoc) -> Self {
match other {
CCLoc::Reg(r) => ValueLocation::Reg(r),
CCLoc::Stack(o) => ValueLocation::Stack(o),
}
}
}
impl ValueLocation {
fn immediate(self) -> Option<Value> {
match self {
ValueLocation::Immediate(i) => Some(i),
_ => None,
}
}
fn imm_i32(self) -> Option<i32> {
self.immediate().and_then(Value::as_i32)
}
fn imm_i64(self) -> Option<i64> {
self.immediate().and_then(Value::as_i64)
}
fn imm_f32(self) -> Option<wasmparser::Ieee32> {
self.immediate().and_then(Value::as_f32)
}
fn imm_f64(self) -> Option<wasmparser::Ieee64> {
self.immediate().and_then(Value::as_f64)
}
}
// TODO: This assumes only system-v calling convention.
// In system-v calling convention the first 6 arguments are passed via registers.
// All rest arguments are passed on the stack.
const INTEGER_ARGS_IN_GPRS: &[GPR] = &[RSI, RDX, RCX, R8, R9];
const INTEGER_RETURN_GPRS: &[GPR] = &[RAX, RDX];
const FLOAT_ARGS_IN_GPRS: &[GPR] = &[XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7];
const FLOAT_RETURN_GPRS: &[GPR] = &[XMM0, XMM1];
// List of scratch registers taken from https://wiki.osdev.org/System_V_ABI
const SCRATCH_REGS: &[GPR] = &[
RSI, RDX, RCX, R8, R9, RAX, R10, R11, XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7, XMM8,
XMM9, XMM10, XMM11, XMM12, XMM13, XMM14, XMM15,
];
const VMCTX: RegId = rq::RDI;
#[must_use]
#[derive(Debug, Clone)]
pub struct FunctionEnd {
should_generate_epilogue: bool,
}
pub struct CodeGenSession<'module, M> {
assembler: Assembler,
pub module_context: &'module M,
labels: Labels,
func_starts: Vec<(Option<AssemblyOffset>, DynamicLabel)>,
}
impl<'module, M> CodeGenSession<'module, M> {
pub fn new(func_count: u32, module_context: &'module M) -> Self {
let mut assembler = Assembler::new().unwrap();
let func_starts = iter::repeat_with(|| (None, assembler.new_dynamic_label()))
.take(func_count as usize)
.collect::<Vec<_>>();
CodeGenSession {
assembler,
labels: Default::default(),
func_starts,
module_context,
}
}
pub fn new_context<'this>(
&'this mut self,
func_idx: u32,
reloc_sink: &'this mut dyn binemit::RelocSink,
) -> Context<'this, M> {
{
let func_start = &mut self.func_starts[func_idx as usize];
// At this point we know the exact start address of this function. Save it
// and define dynamic label at this location.
func_start.0 = Some(self.assembler.offset());
self.assembler.dynamic_label(func_start.1);
}
Context {
asm: &mut self.assembler,
current_function: func_idx,
reloc_sink,
func_starts: &self.func_starts,
labels: &mut self.labels,
block_state: Default::default(),
module_context: self.module_context,
}
}
pub fn into_translated_code_section(self) -> Result<TranslatedCodeSection, Error> {
let exec_buf = self
.assembler
.finalize()
.map_err(|_asm| Error::Assembler("assembler error".to_owned()))?;
let func_starts = self
.func_starts
.iter()
.map(|(offset, _)| offset.unwrap())
.collect::<Vec<_>>();
Ok(TranslatedCodeSection {
exec_buf,
func_starts,
// TODO
relocatable_accesses: vec![],
})
}
}
#[derive(Debug)]
struct RelocateAddress {
reg: Option<GPR>,
imm: usize,
}
#[derive(Debug)]
struct RelocateAccess {
position: AssemblyOffset,
dst_reg: GPR,
address: RelocateAddress,
}
#[derive(Debug)]
pub struct TranslatedCodeSection {
exec_buf: ExecutableBuffer,
func_starts: Vec<AssemblyOffset>,
relocatable_accesses: Vec<RelocateAccess>,
}
impl TranslatedCodeSection {
pub fn func_start(&self, idx: usize) -> *const u8 {
let offset = self.func_starts[idx];
self.exec_buf.ptr(offset)
}
pub fn func_range(&self, idx: usize) -> std::ops::Range<usize> {
let end = self
.func_starts
.get(idx + 1)
.map(|i| i.0)
.unwrap_or(self.exec_buf.len());
self.func_starts[idx].0..end
}
pub fn funcs<'a>(&'a self) -> impl Iterator<Item = std::ops::Range<usize>> + 'a {
(0..self.func_starts.len()).map(move |i| self.func_range(i))
}
pub fn buffer(&self) -> &[u8] {
&*self.exec_buf
}
pub fn disassemble(&self) {
crate::disassemble::disassemble(&*self.exec_buf).unwrap();
}
}
#[derive(Debug, Default, Clone)]
pub struct BlockState {
stack: Stack,
depth: StackDepth,
regs: Registers,
}
type Stack = Vec<ValueLocation>;
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
enum LabelValue {
I32(i32),
I64(i64),
}
type Labels = HashMap<
(u32, Either<TypeId, (LabelValue, Option<LabelValue>)>),
(Label, u32, Option<Box<FnMut(&mut Assembler)>>),
>;
pub struct Context<'this, M> {
asm: &'this mut Assembler,
reloc_sink: &'this mut dyn binemit::RelocSink,
module_context: &'this M,
current_function: u32,
func_starts: &'this Vec<(Option<AssemblyOffset>, DynamicLabel)>,
/// Each push and pop on the value stack increments or decrements this value by 1 respectively.
pub block_state: BlockState,
labels: &'this mut Labels,
}
/// Label in code.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct Label(DynamicLabel);
/// Offset from starting value of SP counted in words.
#[derive(Default, Debug, Copy, Clone, PartialEq, Eq)]
pub struct StackDepth(u32);
impl StackDepth {
pub fn reserve(&mut self, slots: u32) {
self.0 += slots;
}
pub fn free(&mut self, slots: u32) {
self.0 -= slots;
}
}
macro_rules! int_div {
($full_div_s:ident, $full_div_u:ident, $div_u:ident, $div_s:ident, $rem_u:ident, $rem_s:ident, $imm_fn:ident, $signed_ty:ty, $unsigned_ty:ty) => {
// TODO: Fast div using mul for constant divisor? It looks like LLVM doesn't do that for us when
// emitting Wasm.
pub fn $div_u(&mut self) {
let divisor = self.pop();
let quotient = self.pop();
if let (Some(quotient), Some(divisor)) = (quotient.$imm_fn(), divisor.$imm_fn()) {
if divisor == 0 {
self.trap();
self.push(ValueLocation::Immediate((0 as $unsigned_ty).into()));
} else {
self.push(ValueLocation::Immediate(
<$unsigned_ty>::wrapping_div(quotient as _, divisor as _).into(),
));
}
return;
}
let (div, rem, mut saved) = self.$full_div_u(divisor, quotient);
self.free_value(rem);
let div = match div {
ValueLocation::Reg(div) => {
if saved.any(|(_, dst)| dst == div) {
let new = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new.rq().unwrap()), Rq(div.rq().unwrap())
);
self.block_state.regs.release(div);
ValueLocation::Reg(new)
} else {
ValueLocation::Reg(div)
}
}
_ => div,
};
self.cleanup_gprs(saved);
self.push(div);
}
// TODO: Fast div using mul for constant divisor? It looks like LLVM doesn't do that for us when
// emitting Wasm.
pub fn $div_s(&mut self) {
let divisor = self.pop();
let quotient = self.pop();
if let (Some(quotient), Some(divisor)) = (quotient.$imm_fn(), divisor.$imm_fn()) {
if divisor == 0 {
self.trap();
self.push(ValueLocation::Immediate((0 as $signed_ty).into()));
} else {
self.push(ValueLocation::Immediate(
<$signed_ty>::wrapping_div(quotient, divisor).into(),
));
}
return;
}
let (div, rem, mut saved) = self.$full_div_s(divisor, quotient);
self.free_value(rem);
let div = match div {
ValueLocation::Reg(div) => {
if saved.any(|(_, dst)| dst == div) {
let new = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new.rq().unwrap()), Rq(div.rq().unwrap())
);
self.block_state.regs.release(div);
ValueLocation::Reg(new)
} else {
ValueLocation::Reg(div)
}
}
_ => div,
};
self.cleanup_gprs(saved);
self.push(div);
}
pub fn $rem_u(&mut self) {
let divisor = self.pop();
let quotient = self.pop();
if let (Some(quotient), Some(divisor)) = (quotient.$imm_fn(), divisor.$imm_fn()) {
if divisor == 0 {
self.trap();
self.push(ValueLocation::Immediate((0 as $unsigned_ty).into()));
} else {
self.push(ValueLocation::Immediate(
(quotient as $unsigned_ty % divisor as $unsigned_ty).into(),
));
}
return;
}
let (div, rem, mut saved) = self.$full_div_u(divisor, quotient);
self.free_value(div);
let rem = match rem {
ValueLocation::Reg(rem) => {
if saved.any(|(_, dst)| dst == rem) {
let new = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new.rq().unwrap()), Rq(rem.rq().unwrap())
);
self.block_state.regs.release(rem);
ValueLocation::Reg(new)
} else {
ValueLocation::Reg(rem)
}
}
_ => rem,
};
self.cleanup_gprs(saved);
self.push(rem);
}
pub fn $rem_s(&mut self) {
let divisor = self.pop();
let quotient = self.pop();
if let (Some(quotient), Some(divisor)) = (quotient.$imm_fn(), divisor.$imm_fn()) {
if divisor == 0 {
self.trap();
self.push(ValueLocation::Immediate((0 as $signed_ty).into()));
} else {
self.push(ValueLocation::Immediate((quotient % divisor).into()));
}
return;
}
let (div, rem, mut saved) = self.$full_div_s(divisor, quotient);
self.free_value(div);
let rem = match rem {
ValueLocation::Reg(rem) => {
if saved.any(|(_, dst)| dst == rem) {
let new = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new.rq().unwrap()), Rq(rem.rq().unwrap())
);
self.block_state.regs.release(rem);
ValueLocation::Reg(new)
} else {
ValueLocation::Reg(rem)
}
}
_ => rem,
};
self.cleanup_gprs(saved);
self.push(rem);
}
}
}
macro_rules! unop {
($name:ident, $instr:ident, $reg_ty:tt, $typ:ty, $const_fallback:expr) => {
pub fn $name(&mut self) {
let val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) =>
ValueLocation::Immediate(
($const_fallback(imm.as_int().unwrap() as $typ) as $typ).into()
),
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
let temp = self.take_reg(Type::for_::<$typ>());
dynasm!(self.asm
; $instr $reg_ty(temp.rq().unwrap()), [rsp + offset]
);
ValueLocation::Reg(temp)
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let reg = self.into_reg(GPRType::Rq, val);
let temp = self.take_reg(Type::for_::<$typ>());
dynasm!(self.asm
; $instr $reg_ty(temp.rq().unwrap()), $reg_ty(reg.rq().unwrap())
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
}
}
macro_rules! conversion {
(
$name:ident,
$instr:ident,
$in_reg_ty:tt,
$in_reg_fn:ident,
$out_reg_ty:tt,
$out_reg_fn:ident,
$in_typ:ty,
$out_typ:ty,
$const_ty_fn:ident,
$const_fallback:expr
) => {
pub fn $name(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) =>
ValueLocation::Immediate(
$const_fallback(imm.$const_ty_fn().unwrap()).into()
),
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
let temp = self.take_reg(Type::for_::<$out_typ>());
dynasm!(self.asm
; $instr $out_reg_ty(temp.$out_reg_fn().unwrap()), [rsp + offset]
);
ValueLocation::Reg(temp)
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let reg = self.into_reg(Type::for_::<$in_typ>(), val);
let temp = self.take_reg(Type::for_::<$out_typ>());
val = ValueLocation::Reg(reg);
dynasm!(self.asm
; $instr $out_reg_ty(temp.$out_reg_fn().unwrap()), $in_reg_ty(reg.$in_reg_fn().unwrap())
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
}
}
// TODO: Support immediate `count` parameters
macro_rules! shift {
($name:ident, $reg_ty:tt, $instr:ident, $const_fallback:expr, $ty:expr) => {
pub fn $name(&mut self) {
let mut count = self.pop();
let mut val = self.pop();
if val == ValueLocation::Reg(RCX) {
val = ValueLocation::Reg(self.into_temp_reg($ty, val));
}
// TODO: Maybe allocate `RCX`, write `count` to it and then free `count`.
// Once we've implemented refcounting this will do the right thing
// for free.
let temp_rcx = match count {
ValueLocation::Reg(RCX) => {None}
other => {
let out = if self.block_state.regs.is_free(RCX) {
None
} else {
let new_reg = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new_reg.rq().unwrap()), rcx
);
Some(new_reg)
};
match other {
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let gpr = self.into_reg(I32, other);
dynasm!(self.asm
; mov cl, Rb(gpr.rq().unwrap())
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; mov cl, [rsp + offset]
);
}
ValueLocation::Immediate(imm) => {
dynasm!(self.asm
; mov cl, imm.as_int().unwrap() as i8
);
}
}
out
}
};
self.free_value(count);
self.block_state.regs.mark_used(RCX);
count = ValueLocation::Reg(RCX);
let reg = self.into_reg($ty, val);
dynasm!(self.asm
; $instr $reg_ty(reg.rq().unwrap()), cl
);
self.free_value(count);
if let Some(gpr) = temp_rcx {
dynasm!(self.asm
; mov rcx, Rq(gpr.rq().unwrap())
);
self.block_state.regs.release(gpr);
}
self.push(ValueLocation::Reg(reg));
}
}
}
macro_rules! cmp_i32 {
($name:ident, $flags:expr, $reverse_flags:expr, $const_fallback:expr) => {
pub fn $name(&mut self) {
let right = self.pop();
let mut left = self.pop();
let out = if let Some(i) = left.imm_i32() {
match right {
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmp DWORD [rsp + offset], i
);
ValueLocation::Cond($reverse_flags)
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let rreg = self.into_reg(I32, right);
dynasm!(self.asm
; cmp Rd(rreg.rq().unwrap()), i
);
ValueLocation::Cond($reverse_flags)
}
ValueLocation::Immediate(right) => {
ValueLocation::Immediate(
(if $const_fallback(i, right.as_i32().unwrap()) {
1i32
} else {
0i32
}).into()
)
}
}
} else {
let lreg = self.into_reg(I32, left);
// TODO: Make `into_reg` take an `&mut`?
left = ValueLocation::Reg(lreg);
match right {
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmp Rd(lreg.rq().unwrap()), [rsp + offset]
);
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let rreg = self.into_reg(I32, right);
dynasm!(self.asm
; cmp Rd(lreg.rq().unwrap()), Rd(rreg.rq().unwrap())
);
}
ValueLocation::Immediate(i) => {
dynasm!(self.asm
; cmp Rd(lreg.rq().unwrap()), i.as_i32().unwrap()
);
}
}
ValueLocation::Cond($flags)
};
self.free_value(left);
self.free_value(right);
self.push(out);
}
}
}
macro_rules! cmp_i64 {
($name:ident, $flags:expr, $reverse_flags:expr, $const_fallback:expr) => {
pub fn $name(&mut self) {
let right = self.pop();
let mut left = self.pop();
let out = if let Some(i) = left.imm_i64() {
match right {
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
if let Some(i) = i.try_into() {
dynasm!(self.asm
; cmp QWORD [rsp + offset], i
);
} else {
unimplemented!("Unsupported `cmp` with large 64-bit immediate operand");
}
ValueLocation::Cond($reverse_flags)
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let rreg = self.into_reg(I32, right);
if let Some(i) = i.try_into() {
dynasm!(self.asm
; cmp Rq(rreg.rq().unwrap()), i
);
} else {
unimplemented!("Unsupported `cmp` with large 64-bit immediate operand");
}
ValueLocation::Cond($reverse_flags)
}
ValueLocation::Immediate(right) => {
ValueLocation::Immediate(
(if $const_fallback(i, right.as_i64().unwrap()) {
1i32
} else {
0i32
}).into()
)
}
}
} else {
let lreg = self.into_reg(I64, left);
left = ValueLocation::Reg(lreg);
match right {
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmp Rq(lreg.rq().unwrap()), [rsp + offset]
);
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let rreg = self.into_reg(I32, right);
dynasm!(self.asm
; cmp Rq(lreg.rq().unwrap()), Rq(rreg.rq().unwrap())
);
}
ValueLocation::Immediate(i) => {
let i = i.as_i64().unwrap();
if let Some(i) = i.try_into() {
dynasm!(self.asm
; cmp Rq(lreg.rq().unwrap()), i
);
} else {
unimplemented!("Unsupported `cmp` with large 64-bit immediate operand");
}
}
}
ValueLocation::Cond($flags)
};
self.free_value(left);
self.free_value(right);
self.push(out);
}
}
}
macro_rules! cmp_f32 {
($name:ident, $reverse_name:ident, $instr:ident, $const_fallback:expr) => {
cmp_float!(
comiss,
f32,
imm_f32,
$name,
$reverse_name,
$instr,
$const_fallback
);
};
}
macro_rules! eq_float {
($name:ident, $instr:ident, $imm_fn:ident, $const_fallback:expr) => {
pub fn $name(&mut self) {
let right = self.pop();
let left = self.pop();
if let Some(right) = right.immediate() {
if let Some(left) = left.immediate() {
self.push(ValueLocation::Immediate(
if $const_fallback(left.$imm_fn().unwrap(), right.$imm_fn().unwrap()) {
1u32
} else {
0
}.into()
));
return;
}
}
let (left, right) = match left {
ValueLocation::Reg(r) if self.block_state.regs.num_usages(r) <= 1 => (left, right),
_ => (right, left)
};
let left = self.into_temp_reg(GPRType::Rx, left);
let right = self.into_reg(GPRType::Rx, right);
let out = self.take_reg(I32);
dynasm!(self.asm
; $instr Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
; movd Rd(out.rq().unwrap()), Rx(left.rx().unwrap())
; and Rd(out.rq().unwrap()), 1
);
self.push(ValueLocation::Reg(out));
self.free_value(ValueLocation::Reg(left));
self.free_value(ValueLocation::Reg(right));
}
}
}
macro_rules! minmax_float {
(
$name:ident,
$instr:ident,
$cmpinstr:ident,
$addinstr:ident,
$combineinstr:ident,
$imm_fn:ident,
$const_fallback:expr
) => {
pub fn $name(&mut self) {
let right = self.pop();
let left = self.pop();
if let Some(right) = right.immediate() {
if let Some(left) = left.immediate() {
self.push(ValueLocation::Immediate(
$const_fallback(left.$imm_fn().unwrap(), right.$imm_fn().unwrap()).into()
));
return;
}
}
let (left, right) = match left {
ValueLocation::Reg(r) if self.block_state.regs.num_usages(r) <= 1 => (left, right),
_ => (right, left)
};
let left = self.into_temp_reg(GPRType::Rx, left);
let right = self.into_reg(GPRType::Rx, right);
dynasm!(self.asm
; $cmpinstr Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
; je >equal
; $instr Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
; jmp >ret
; equal:
; jnp >equal_but_not_parity
; $addinstr Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
; jmp >ret
; equal_but_not_parity:
; $combineinstr Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
; ret:
);
self.push(ValueLocation::Reg(left));
self.free_value(ValueLocation::Reg(right));
}
}
}
macro_rules! cmp_f64 {
($name:ident, $reverse_name:ident, $instr:ident, $const_fallback:expr) => {
cmp_float!(
comisd,
f64,
imm_f64,
$name,
$reverse_name,
$instr,
$const_fallback
);
};
}
macro_rules! cmp_float {
(@helper $cmp_instr:ident, $ty:ty, $imm_fn:ident, $self:expr, $left:expr, $right:expr, $instr:ident, $const_fallback:expr) => {{
let (left, right, this) = ($left, $right, $self);
if let (Some(left), Some(right)) = (left.$imm_fn(), right.$imm_fn()) {
if $const_fallback(<$ty>::from_bits(left.bits()), <$ty>::from_bits(right.bits())) {
ValueLocation::Immediate(1i32.into())
} else {
ValueLocation::Immediate(0i32.into())
}
} else {
let lreg = this.into_reg(GPRType::Rx, *left);
*left = ValueLocation::Reg(lreg);
let result = this.take_reg(I32);
match right {
ValueLocation::Stack(offset) => {
let offset = this.adjusted_offset(*offset);
dynasm!(this.asm
; xor Rq(result.rq().unwrap()), Rq(result.rq().unwrap())
; $cmp_instr Rx(lreg.rx().unwrap()), [rsp + offset]
; $instr Rb(result.rq().unwrap())
);
}
right => {
let rreg = this.into_reg(GPRType::Rx, *right);
*right = ValueLocation::Reg(rreg);
dynasm!(this.asm
; xor Rq(result.rq().unwrap()), Rq(result.rq().unwrap())
; $cmp_instr Rx(lreg.rx().unwrap()), Rx(rreg.rx().unwrap())
; $instr Rb(result.rq().unwrap())
);
}
}
ValueLocation::Reg(result)
}
}};
($cmp_instr:ident, $ty:ty, $imm_fn:ident, $name:ident, $reverse_name:ident, $instr:ident, $const_fallback:expr) => {
pub fn $name(&mut self) {
let mut right = self.pop();
let mut left = self.pop();
let out = cmp_float!(@helper
$cmp_instr,
$ty,
$imm_fn,
&mut *self,
&mut left,
&mut right,
$instr,
$const_fallback
);
self.free_value(left);
self.free_value(right);
self.push(out);
}
pub fn $reverse_name(&mut self) {
let mut right = self.pop();
let mut left = self.pop();
let out = cmp_float!(@helper
$cmp_instr,
$ty,
$imm_fn,
&mut *self,
&mut right,
&mut left,
$instr,
$const_fallback
);
self.free_value(left);
self.free_value(right);
self.push(out);
}
};
}
macro_rules! binop_i32 {
($name:ident, $instr:ident, $const_fallback:expr) => {
binop!(
$name,
$instr,
$const_fallback,
Rd,
rq,
I32,
imm_i32,
|this: &mut Context<_>, op1: GPR, i| dynasm!(this.asm
; $instr Rd(op1.rq().unwrap()), i
)
);
};
}
macro_rules! commutative_binop_i32 {
($name:ident, $instr:ident, $const_fallback:expr) => {
commutative_binop!(
$name,
$instr,
$const_fallback,
Rd,
rq,
I32,
imm_i32,
|this: &mut Context<_>, op1: GPR, i| dynasm!(this.asm
; $instr Rd(op1.rq().unwrap()), i
)
);
};
}
macro_rules! binop_i64 {
($name:ident, $instr:ident, $const_fallback:expr) => {
binop!(
$name,
$instr,
$const_fallback,
Rq,
rq,
I64,
imm_i64,
|this: &mut Context<_>, op1: GPR, i| dynasm!(this.asm
; $instr Rq(op1.rq().unwrap()), i
)
);
};
}
macro_rules! commutative_binop_i64 {
($name:ident, $instr:ident, $const_fallback:expr) => {
commutative_binop!(
$name,
$instr,
$const_fallback,
Rq,
rq,
I64,
imm_i64,
|this: &mut Context<_>, op1: GPR, i| dynasm!(this.asm
; $instr Rq(op1.rq().unwrap()), i
)
);
};
}
macro_rules! binop_f32 {
($name:ident, $instr:ident, $const_fallback:expr) => {
binop!(
$name,
$instr,
|a: wasmparser::Ieee32, b: wasmparser::Ieee32| wasmparser::Ieee32(
$const_fallback(f32::from_bits(a.bits()), f32::from_bits(b.bits())).to_bits()
),
Rx,
rx,
F32,
imm_f32,
|_, _, _| unreachable!()
);
};
}
macro_rules! commutative_binop_f32 {
($name:ident, $instr:ident, $const_fallback:expr) => {
commutative_binop!(
$name,
$instr,
|a: wasmparser::Ieee32, b: wasmparser::Ieee32| wasmparser::Ieee32(
$const_fallback(f32::from_bits(a.bits()), f32::from_bits(b.bits())).to_bits()
),
Rx,
rx,
F32,
imm_f32,
|_, _, _| unreachable!()
);
};
}
macro_rules! binop_f64 {
($name:ident, $instr:ident, $const_fallback:expr) => {
binop!(
$name,
$instr,
|a: wasmparser::Ieee64, b: wasmparser::Ieee64| wasmparser::Ieee64(
$const_fallback(f64::from_bits(a.bits()), f64::from_bits(b.bits())).to_bits()
),
Rx,
rx,
F64,
imm_f64,
|_, _, _| unreachable!()
);
};
}
macro_rules! commutative_binop_f64 {
($name:ident, $instr:ident, $const_fallback:expr) => {
commutative_binop!(
$name,
$instr,
|a: wasmparser::Ieee64, b: wasmparser::Ieee64| wasmparser::Ieee64(
$const_fallback(f64::from_bits(a.bits()), f64::from_bits(b.bits())).to_bits()
),
Rx,
rx,
F64,
imm_f64,
|_, _, _| unreachable!()
);
};
}
macro_rules! commutative_binop {
($name:ident, $instr:ident, $const_fallback:expr, $reg_ty:tt, $reg_fn:ident, $ty:expr, $imm_fn:ident, $direct_imm:expr) => {
binop!(
$name,
$instr,
$const_fallback,
$reg_ty,
$reg_fn,
$ty,
$imm_fn,
$direct_imm,
|op1: ValueLocation, op0: ValueLocation| match op1 {
ValueLocation::Reg(_) => (op1, op0),
_ => {
if op0.immediate().is_some() {
(op1, op0)
} else {
(op0, op1)
}
}
}
);
};
}
macro_rules! binop {
($name:ident, $instr:ident, $const_fallback:expr, $reg_ty:tt, $reg_fn:ident, $ty:expr, $imm_fn:ident, $direct_imm:expr) => {
binop!($name, $instr, $const_fallback, $reg_ty, $reg_fn, $ty, $imm_fn, $direct_imm, |a, b| (a, b));
};
($name:ident, $instr:ident, $const_fallback:expr, $reg_ty:tt, $reg_fn:ident, $ty:expr, $imm_fn:ident, $direct_imm:expr, $map_op:expr) => {
pub fn $name(&mut self) {
let right = self.pop();
let left = self.pop();
if let Some(i1) = left.$imm_fn() {
if let Some(i0) = right.$imm_fn() {
self.block_state.stack.push(ValueLocation::Immediate($const_fallback(i1, i0).into()));
return;
}
}
let (left, mut right) = $map_op(left, right);
let left = self.into_temp_reg($ty, left);
match right {
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
// This handles the case where we (for example) have a float in an `Rq` reg
let right_reg = self.into_reg($ty, right);
right = ValueLocation::Reg(right_reg);
dynasm!(self.asm
; $instr $reg_ty(left.$reg_fn().unwrap()), $reg_ty(right_reg.$reg_fn().unwrap())
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; $instr $reg_ty(left.$reg_fn().unwrap()), [rsp + offset]
);
}
ValueLocation::Immediate(i) => {
if let Some(i) = i.as_int().and_then(|i| i.try_into()) {
$direct_imm(&mut *self, left, i);
} else {
let scratch = self.take_reg($ty);
self.immediate_to_reg(scratch, i);
dynasm!(self.asm
; $instr $reg_ty(left.$reg_fn().unwrap()), $reg_ty(scratch.$reg_fn().unwrap())
);
self.block_state.regs.release(scratch);
}
}
}
self.free_value(right);
self.push(ValueLocation::Reg(left));
}
}
}
macro_rules! load {
(@inner $name:ident, $rtype:expr, $reg_ty:tt, $emit_fn:expr) => {
pub fn $name(&mut self, offset: u32) {
fn load_to_reg<_M: ModuleContext>(
ctx: &mut Context<_M>,
dst: GPR,
(offset, runtime_offset): (i32, Result<i32, GPR>)
) {
let mem_index = 0;
let reg_offset = ctx.module_context
.defined_memory_index(mem_index)
.map(|index| (
None,
ctx.module_context.vmctx_vmmemory_definition(index) as i32
));
let (reg, mem_offset) = reg_offset.unwrap_or_else(|| {
let reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rq(reg.rq().unwrap()), [
Rq(VMCTX) + ctx.module_context.vmctx_vmmemory_import_from(mem_index) as i32
]
);
(Some(reg), 0)
});
let vmctx = GPR::Rq(VMCTX);
if ctx.module_context.emit_memory_bounds_check() {
let trap_label = ctx.trap_label();
let addr_reg = match runtime_offset {
Ok(imm) => {
let addr_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rq(addr_reg.rq().unwrap()), QWORD imm as i64 + offset as i64
);
addr_reg
}
Err(gpr) => {
if offset == 0 {
ctx.to_reg(I32, ValueLocation::Reg(gpr))
} else if offset > 0 {
let addr_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; lea Rq(addr_reg.rq().unwrap()), [Rq(gpr.rq().unwrap()) + offset]
);
addr_reg
} else {
let addr_reg = ctx.take_reg(I64);
let offset_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rd(offset_reg.rq().unwrap()), offset
; mov Rq(addr_reg.rq().unwrap()), Rq(gpr.rq().unwrap())
; add Rq(addr_reg.rq().unwrap()), Rq(offset_reg.rq().unwrap())
);
ctx.block_state.regs.release(offset_reg);
addr_reg
}
}
};
dynasm!(ctx.asm
; cmp [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) +
mem_offset +
ctx.module_context.vmmemory_definition_current_length() as i32
], Rq(addr_reg.rq().unwrap())
; jna =>trap_label.0
);
ctx.block_state.regs.release(addr_reg);
}
let mem_ptr_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rq(mem_ptr_reg.rq().unwrap()), [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) +
mem_offset +
ctx.module_context.vmmemory_definition_base() as i32
]
);
if let Some(reg) = reg {
ctx.block_state.regs.release(reg);
}
$emit_fn(ctx, dst, mem_ptr_reg, runtime_offset, offset);
ctx.block_state.regs.release(mem_ptr_reg);
}
let base = self.pop();
let temp = self.take_reg($rtype);
match base {
ValueLocation::Immediate(i) => {
load_to_reg(self, temp, (offset as _, Ok(i.as_i32().unwrap())));
}
base => {
let gpr = self.into_reg(I32, base);
load_to_reg(self, temp, (offset as _, Err(gpr)));
self.block_state.regs.release(gpr);
}
}
self.push(ValueLocation::Reg(temp));
}
};
($name:ident, $rtype:expr, $reg_ty:tt, NONE, $rq_instr:ident, $ty:ident) => {
load!(@inner
$name,
$rtype,
$reg_ty,
|ctx: &mut Context<_>, dst: GPR, mem_ptr_reg: GPR, runtime_offset: Result<i32, GPR>, offset: i32| {
match runtime_offset {
Ok(imm) => {
dynasm!(ctx.asm
; $rq_instr $reg_ty(dst.rq().unwrap()), $ty [Rq(mem_ptr_reg.rq().unwrap()) + offset + imm]
);
}
Err(offset_reg) => {
dynasm!(ctx.asm
; $rq_instr $reg_ty(dst.rq().unwrap()), $ty [Rq(mem_ptr_reg.rq().unwrap()) + Rq(offset_reg.rq().unwrap()) + offset]
);
}
}
}
);
};
($name:ident, $rtype:expr, $reg_ty:tt, $xmm_instr:ident, $rq_instr:ident, $ty:ident) => {
load!(@inner
$name,
$rtype,
$reg_ty,
|ctx: &mut Context<_>, dst: GPR, mem_ptr_reg: GPR, runtime_offset: Result<i32, GPR>, offset: i32| {
match (dst, runtime_offset) {
(GPR::Rq(r), Ok(imm)) => {
dynasm!(ctx.asm
; $rq_instr $reg_ty(r), $ty [Rq(mem_ptr_reg.rq().unwrap()) + offset + imm]
);
}
(GPR::Rx(r), Ok(imm)) => {
dynasm!(ctx.asm
; $xmm_instr Rx(r), $ty [Rq(mem_ptr_reg.rq().unwrap()) + offset + imm]
);
}
(GPR::Rq(r), Err(offset_reg)) => {
dynasm!(ctx.asm
; $rq_instr $reg_ty(r), $ty [Rq(mem_ptr_reg.rq().unwrap()) + Rq(offset_reg.rq().unwrap()) + offset]
);
}
(GPR::Rx(r), Err(offset_reg)) => {
dynasm!(ctx.asm
; $xmm_instr Rx(r), $ty [Rq(mem_ptr_reg.rq().unwrap()) + Rq(offset_reg.rq().unwrap()) + offset]
);
}
}
}
);
};
}
macro_rules! store {
(@inner $name:ident, $int_reg_ty:tt, $match_offset:expr, $size:ident) => {
pub fn $name(&mut self, offset: u32) {
fn store_from_reg<_M: ModuleContext>(
ctx: &mut Context<_M>,
src: GPR,
(offset, runtime_offset): (i32, Result<i32, GPR>)
) {
let mem_index = 0;
let reg_offset = ctx.module_context
.defined_memory_index(mem_index)
.map(|index| (
None,
ctx.module_context.vmctx_vmmemory_definition(index) as i32
));
let (reg, mem_offset) = reg_offset.unwrap_or_else(|| {
let reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rq(reg.rq().unwrap()), [
Rq(VMCTX) + ctx.module_context.vmctx_vmmemory_import_from(mem_index) as i32
]
);
(Some(reg), 0)
});
let vmctx = GPR::Rq(VMCTX);
if ctx.module_context.emit_memory_bounds_check() {
let trap_label = ctx.trap_label();
let addr_reg = match runtime_offset {
Ok(imm) => {
let addr_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rq(addr_reg.rq().unwrap()), QWORD imm as i64 + offset as i64
);
addr_reg
}
Err(gpr) => {
if offset == 0 {
ctx.to_reg(I32, ValueLocation::Reg(gpr))
} else if offset > 0 {
let addr_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; lea Rq(addr_reg.rq().unwrap()), [Rq(gpr.rq().unwrap()) + offset]
);
addr_reg
} else {
let addr_reg = ctx.take_reg(I64);
let offset_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rd(offset_reg.rq().unwrap()), offset
; mov Rq(addr_reg.rq().unwrap()), Rq(gpr.rq().unwrap())
; add Rq(addr_reg.rq().unwrap()), Rq(offset_reg.rq().unwrap())
);
ctx.block_state.regs.release(offset_reg);
addr_reg
}
}
};
dynasm!(ctx.asm
; cmp Rq(addr_reg.rq().unwrap()), [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) +
mem_offset +
ctx.module_context.vmmemory_definition_current_length() as i32
]
; jae =>trap_label.0
);
ctx.block_state.regs.release(addr_reg);
}
let mem_ptr_reg = ctx.take_reg(I64);
dynasm!(ctx.asm
; mov Rq(mem_ptr_reg.rq().unwrap()), [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) +
mem_offset +
ctx.module_context.vmmemory_definition_base() as i32
]
);
if let Some(reg) = reg {
ctx.block_state.regs.release(reg);
}
let src = $match_offset(ctx, mem_ptr_reg, runtime_offset, offset, src);
ctx.block_state.regs.release(mem_ptr_reg);
ctx.block_state.regs.release(src);
}
assert!(offset <= i32::max_value() as u32);
let src = self.pop();
let base = self.pop();
let src_reg = self.into_reg(None, src);
match base {
ValueLocation::Immediate(i) => {
store_from_reg(self, src_reg, (offset as i32, Ok(i.as_i32().unwrap())));
}
base => {
let gpr = self.into_reg(I32, base);
store_from_reg(self, src_reg, (offset as i32, Err(gpr)));
self.block_state.regs.release(gpr);
}
}
}
};
($name:ident, $int_reg_ty:tt, NONE, $size:ident) => {
store!(@inner
$name,
$int_reg_ty,
|ctx: &mut Context<_>, mem_ptr_reg: GPR, runtime_offset: Result<i32, GPR>, offset: i32, src| {
let src_reg = ctx.into_temp_reg(GPRType::Rq, ValueLocation::Reg(src));
match runtime_offset {
Ok(imm) => {
dynasm!(ctx.asm
; mov [Rq(mem_ptr_reg.rq().unwrap()) + offset + imm], $int_reg_ty(src_reg.rq().unwrap())
);
}
Err(offset_reg) => {
dynasm!(ctx.asm
; mov [Rq(mem_ptr_reg.rq().unwrap()) + Rq(offset_reg.rq().unwrap()) + offset], $int_reg_ty(src_reg.rq().unwrap())
);
}
}
src_reg
},
$size
);
};
($name:ident, $int_reg_ty:tt, $xmm_instr:ident, $size:ident) => {
store!(@inner
$name,
$int_reg_ty,
|ctx: &mut Context<_>, mem_ptr_reg: GPR, runtime_offset: Result<i32, GPR>, offset: i32, src| {
match (runtime_offset, src) {
(Ok(imm), GPR::Rq(r)) => {
dynasm!(ctx.asm
; mov [Rq(mem_ptr_reg.rq().unwrap()) + offset + imm], $int_reg_ty(r)
);
}
(Ok(imm), GPR::Rx(r)) => {
dynasm!(ctx.asm
; $xmm_instr [Rq(mem_ptr_reg.rq().unwrap()) + offset + imm], Rx(r)
);
}
(Err(offset_reg), GPR::Rq(r)) => {
dynasm!(ctx.asm
; mov [Rq(mem_ptr_reg.rq().unwrap()) + Rq(offset_reg.rq().unwrap()) + offset], $int_reg_ty(r)
);
}
(Err(offset_reg), GPR::Rx(r)) => {
dynasm!(ctx.asm
; $xmm_instr [Rq(mem_ptr_reg.rq().unwrap()) + Rq(offset_reg.rq().unwrap()) + offset], Rx(r)
);
}
}
src
},
$size
);
};
}
trait TryInto<O> {
fn try_into(self) -> Option<O>;
}
impl TryInto<i64> for u64 {
fn try_into(self) -> Option<i64> {
let max = i64::max_value() as u64;
if self <= max {
Some(self as i64)
} else {
None
}
}
}
impl TryInto<i32> for i64 {
fn try_into(self) -> Option<i32> {
let min = i32::min_value() as i64;
let max = i32::max_value() as i64;
if self >= min && self <= max {
Some(self as i32)
} else {
None
}
}
}
#[derive(Debug, Clone)]
pub struct VirtualCallingConvention {
pub stack: Stack,
pub depth: StackDepth,
}
impl<'this, M: ModuleContext> Context<'this, M> {
fn take_reg(&mut self, r: impl Into<GPRType>) -> GPR {
let r = r.into();
loop {
if let Some(gpr) = self.block_state.regs.take(r) {
break gpr;
}
let loc = self
.block_state
.stack
.iter()
.position(|r| {
if let ValueLocation::Reg(_) = r {
true
} else {
false
}
})
.unwrap_or_else(|| panic!("Leaking GPRs (stack: {:?})", self.block_state.stack));
let new_loc = self.push_physical(self.block_state.stack[loc]);
self.block_state.stack[loc] = new_loc;
}
}
pub fn virtual_calling_convention(&self) -> VirtualCallingConvention {
VirtualCallingConvention {
stack: self.block_state.stack.clone(),
depth: self.block_state.depth,
}
}
/// Create a new undefined label.
pub fn create_label(&mut self) -> Label {
Label(self.asm.new_dynamic_label())
}
pub fn define_host_fn(&mut self, host_fn: *const u8) {
dynasm!(self.asm
; mov rax, QWORD host_fn as i64
; call rax
; ret
);
}
fn adjusted_offset(&self, offset: i32) -> i32 {
(self.block_state.depth.0 as i32 + offset) * WORD_SIZE as i32
}
cmp_i32!(i32_eq, cc::EQUAL, cc::EQUAL, |a, b| a == b);
cmp_i32!(i32_neq, cc::NOT_EQUAL, cc::NOT_EQUAL, |a, b| a != b);
// `dynasm-rs` inexplicably doesn't support setb but `setnae` (and `setc`) are synonymous
cmp_i32!(i32_lt_u, cc::LT_U, cc::GT_U, |a, b| (a as u32) < (b as u32));
cmp_i32!(i32_le_u, cc::LE_U, cc::GE_U, |a, b| (a as u32)
<= (b as u32));
cmp_i32!(i32_gt_u, cc::GT_U, cc::LT_U, |a, b| (a as u32) > (b as u32));
cmp_i32!(i32_ge_u, cc::GE_U, cc::LE_U, |a, b| (a as u32)
>= (b as u32));
cmp_i32!(i32_lt_s, cc::LT_S, cc::GT_S, |a, b| a < b);
cmp_i32!(i32_le_s, cc::LE_S, cc::GE_S, |a, b| a <= b);
cmp_i32!(i32_gt_s, cc::GT_S, cc::LT_S, |a, b| a > b);
cmp_i32!(i32_ge_s, cc::GE_S, cc::LE_S, |a, b| a >= b);
cmp_i64!(i64_eq, cc::EQUAL, cc::EQUAL, |a, b| a == b);
cmp_i64!(i64_neq, cc::NOT_EQUAL, cc::NOT_EQUAL, |a, b| a != b);
// `dynasm-rs` inexplicably doesn't support setb but `setnae` (and `setc`) are synonymous
cmp_i64!(i64_lt_u, cc::LT_U, cc::GT_U, |a, b| (a as u64) < (b as u64));
cmp_i64!(i64_le_u, cc::LE_U, cc::GE_U, |a, b| (a as u64)
<= (b as u64));
cmp_i64!(i64_gt_u, cc::GT_U, cc::LT_U, |a, b| (a as u64) > (b as u64));
cmp_i64!(i64_ge_u, cc::GE_U, cc::LE_U, |a, b| (a as u64)
>= (b as u64));
cmp_i64!(i64_lt_s, cc::LT_S, cc::GT_S, |a, b| a < b);
cmp_i64!(i64_le_s, cc::LE_S, cc::GE_S, |a, b| a <= b);
cmp_i64!(i64_gt_s, cc::GT_S, cc::LT_S, |a, b| a > b);
cmp_i64!(i64_ge_s, cc::GE_S, cc::LE_S, |a, b| a >= b);
cmp_f32!(f32_gt, f32_lt, seta, |a, b| a > b);
cmp_f32!(f32_ge, f32_le, setnc, |a, b| a >= b);
eq_float!(
f32_eq,
cmpeqss,
as_f32,
|a: wasmparser::Ieee32, b: wasmparser::Ieee32| f32::from_bits(a.0) == f32::from_bits(b.0)
);
eq_float!(
f32_ne,
cmpneqss,
as_f32,
|a: wasmparser::Ieee32, b: wasmparser::Ieee32| f32::from_bits(a.0) != f32::from_bits(b.0)
);
cmp_f64!(f64_gt, f64_lt, seta, |a, b| a > b);
cmp_f64!(f64_ge, f64_le, setnc, |a, b| a >= b);
eq_float!(
f64_eq,
cmpeqsd,
as_f64,
|a: wasmparser::Ieee64, b: wasmparser::Ieee64| f64::from_bits(a.0) == f64::from_bits(b.0)
);
eq_float!(
f64_ne,
cmpneqsd,
as_f64,
|a: wasmparser::Ieee64, b: wasmparser::Ieee64| f64::from_bits(a.0) != f64::from_bits(b.0)
);
// TODO: Should we do this logic in `eq` and just have this delegate to `eq`?
// That would mean that `eqz` and `eq` with a const 0 argument don't
// result in different code. It would also allow us to generate better
// code for `neq` and `gt_u` with const 0 operand
pub fn i32_eqz(&mut self) {
let val = self.pop();
if let ValueLocation::Immediate(Value::I32(i)) = val {
self.push(ValueLocation::Immediate(
(if i == 0 { 1i32 } else { 0 }).into(),
));
return;
}
let reg = self.into_reg(I32, val);
let out = self.take_reg(I32);
dynasm!(self.asm
; xor Rd(out.rq().unwrap()), Rd(out.rq().unwrap())
; test Rd(reg.rq().unwrap()), Rd(reg.rq().unwrap())
; setz Rb(out.rq().unwrap())
);
self.block_state.regs.release(reg);
self.push(ValueLocation::Reg(out));
}
pub fn i64_eqz(&mut self) {
let val = self.pop();
if let ValueLocation::Immediate(Value::I64(i)) = val {
self.push(ValueLocation::Immediate(
(if i == 0 { 1i32 } else { 0 }).into(),
));
return;
}
let reg = self.into_reg(I64, val);
let out = self.take_reg(I64);
dynasm!(self.asm
; xor Rd(out.rq().unwrap()), Rd(out.rq().unwrap())
; test Rq(reg.rq().unwrap()), Rq(reg.rq().unwrap())
; setz Rb(out.rq().unwrap())
);
self.block_state.regs.release(reg);
self.push(ValueLocation::Reg(out));
}
fn br_on_cond_code(&mut self, label: Label, cond: CondCode) {
match cond {
cc::EQUAL => dynasm!(self.asm
; je =>label.0
),
cc::NOT_EQUAL => dynasm!(self.asm
; jne =>label.0
),
cc::GT_U => dynasm!(self.asm
; ja =>label.0
),
cc::GE_U => dynasm!(self.asm
; jae =>label.0
),
cc::LT_U => dynasm!(self.asm
; jb =>label.0
),
cc::LE_U => dynasm!(self.asm
; jbe =>label.0
),
cc::GT_S => dynasm!(self.asm
; jg =>label.0
),
cc::GE_S => dynasm!(self.asm
; jge =>label.0
),
cc::LT_S => dynasm!(self.asm
; jl =>label.0
),
cc::LE_S => dynasm!(self.asm
; jle =>label.0
),
}
}
/// Pops i32 predicate and branches to the specified label
/// if the predicate is equal to zero.
pub fn br_if_false(
&mut self,
target: impl Into<BrTarget<Label>>,
pass_args: impl FnOnce(&mut Self),
) {
let val = self.pop();
let label = target
.into()
.label()
.map(|c| *c)
.unwrap_or_else(|| self.ret_label());
let cond = match val {
ValueLocation::Cond(cc) => !cc,
other => {
let predicate = self.into_reg(I32, other);
dynasm!(self.asm
; test Rd(predicate.rq().unwrap()), Rd(predicate.rq().unwrap())
);
self.block_state.regs.release(predicate);
CondCode::ZF0
}
};
pass_args(self);
self.br_on_cond_code(label, cond);
}
/// Pops i32 predicate and branches to the specified label
/// if the predicate is not equal to zero.
pub fn br_if_true(
&mut self,
target: impl Into<BrTarget<Label>>,
pass_args: impl FnOnce(&mut Self),
) {
let val = self.pop();
let label = target
.into()
.label()
.map(|c| *c)
.unwrap_or_else(|| self.ret_label());
let cond = match val {
ValueLocation::Cond(cc) => cc,
other => {
let predicate = self.into_reg(I32, other);
dynasm!(self.asm
; test Rd(predicate.rq().unwrap()), Rd(predicate.rq().unwrap())
);
self.block_state.regs.release(predicate);
CondCode::ZF1
}
};
pass_args(self);
self.br_on_cond_code(label, cond);
}
/// Branch unconditionally to the specified label.
pub fn br(&mut self, label: impl Into<BrTarget<Label>>) {
match label.into() {
BrTarget::Return => self.ret(),
BrTarget::Label(label) => dynasm!(self.asm
; jmp =>label.0
),
}
}
/// If `default` is `None` then the default is just continuing execution
pub fn br_table<I>(
&mut self,
targets: I,
default: Option<BrTarget<Label>>,
pass_args: impl FnOnce(&mut Self),
) where
I: IntoIterator<Item = Option<BrTarget<Label>>>,
I::IntoIter: ExactSizeIterator,
{
let mut targets = targets.into_iter();
let count = targets.len();
let mut selector = self.pop();
pass_args(self);
if let Some(imm) = selector.imm_i32() {
if let Some(target) = targets.nth(imm as _).or(Some(default)).and_then(|a| a) {
match target {
BrTarget::Label(label) => self.br(label),
BrTarget::Return => {
dynasm!(self.asm
; ret
);
}
}
}
} else {
let end_label = self.create_label();
if count > 0 {
let selector_reg = self.into_temp_reg(GPRType::Rq, selector);
selector = ValueLocation::Reg(selector_reg);
let tmp = self.take_reg(I64);
self.immediate_to_reg(tmp, (count as u32).into());
dynasm!(self.asm
; cmp Rq(selector_reg.rq().unwrap()), Rq(tmp.rq().unwrap())
; cmova Rq(selector_reg.rq().unwrap()), Rq(tmp.rq().unwrap())
; lea Rq(tmp.rq().unwrap()), [>start_label]
; lea Rq(selector_reg.rq().unwrap()), [
Rq(selector_reg.rq().unwrap()) * 5
]
; add Rq(selector_reg.rq().unwrap()), Rq(tmp.rq().unwrap())
; jmp Rq(selector_reg.rq().unwrap())
; start_label:
);
self.block_state.regs.release(tmp);
for target in targets {
let label = target
.map(|target| self.target_to_label(target))
.unwrap_or(end_label);
dynasm!(self.asm
; jmp =>label.0
);
}
}
if let Some(def) = default {
match def {
BrTarget::Label(label) => dynasm!(self.asm
; jmp =>label.0
),
BrTarget::Return => dynasm!(self.asm
; ret
),
}
}
self.define_label(end_label);
}
self.free_value(selector);
}
fn set_stack_depth(&mut self, depth: StackDepth) {
if self.block_state.depth.0 != depth.0 {
let diff = depth.0 as i32 - self.block_state.depth.0 as i32;
if diff.abs() == 1 {
if self.block_state.depth.0 < depth.0 {
for _ in 0..depth.0 - self.block_state.depth.0 {
dynasm!(self.asm
; push rax
);
}
} else if self.block_state.depth.0 > depth.0 {
let trash = self.take_reg(I64);
for _ in 0..self.block_state.depth.0 - depth.0 {
dynasm!(self.asm
; pop Rq(trash.rq().unwrap())
);
}
self.block_state.regs.release(trash);
}
} else {
dynasm!(self.asm
; lea rsp, [rsp + (self.block_state.depth.0 as i32 - depth.0 as i32) * WORD_SIZE as i32]
);
}
self.block_state.depth = depth;
}
}
fn do_pass_block_args(&mut self, cc: &BlockCallingConvention) {
let args = &cc.arguments;
for (remaining, &dst) in args
.iter()
.enumerate()
.rev()
.take(self.block_state.stack.len())
{
if let CCLoc::Reg(r) = dst {
if !self.block_state.regs.is_free(r)
&& *self.block_state.stack.last().unwrap() != ValueLocation::Reg(r)
{
// TODO: This would be made simpler and more efficient with a proper SSE
// representation.
self.save_regs(&[r], ..=remaining);
}
self.block_state.regs.mark_used(r);
}
self.pop_into(dst);
}
}
pub fn pass_block_args(&mut self, cc: &BlockCallingConvention) {
self.do_pass_block_args(cc);
self.set_stack_depth(cc.stack_depth);
}
pub fn serialize_block_args(
&mut self,
cc: &BlockCallingConvention,
other_to_drop: Option<RangeInclusive<u32>>,
) -> BlockCallingConvention {
self.do_pass_block_args(cc);
let mut out_args = cc.arguments.clone();
out_args.reverse();
if let Some(to_drop) = other_to_drop {
for _ in to_drop {
let val = self.pop();
// TODO: We can use stack slots for values already on the stack but we
// don't refcount stack slots right now
let loc = CCLoc::Reg(self.into_temp_reg(None, val));
out_args.push(loc);
}
}
out_args.reverse();
self.set_stack_depth(cc.stack_depth);
BlockCallingConvention {
stack_depth: cc.stack_depth,
arguments: out_args,
}
}
/// Puts all stack values into "real" locations so that they can i.e. be set to different
/// values on different iterations of a loop
pub fn serialize_args(&mut self, count: u32) -> BlockCallingConvention {
let mut out = Vec::with_capacity(count as _);
// TODO: We can make this more efficient now that `pop` isn't so complicated
for _ in 0..count {
let val = self.pop();
// TODO: We can use stack slots for values already on the stack but we
// don't refcount stack slots right now
let loc = CCLoc::Reg(self.into_temp_reg(None, val));
out.push(loc);
}
out.reverse();
BlockCallingConvention {
stack_depth: self.block_state.depth,
arguments: out,
}
}
pub fn get_global(&mut self, global_idx: u32) {
let (reg, offset) = self
.module_context
.defined_global_index(global_idx)
.map(|defined_global_index| {
(
None,
self.module_context
.vmctx_vmglobal_definition(defined_global_index),
)
})
.unwrap_or_else(|| {
let reg = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(reg.rq().unwrap()), [
Rq(VMCTX) +
self.module_context.vmctx_vmglobal_import_from(global_idx) as i32
]
);
(Some(reg), 0)
});
let out = self.take_reg(GPRType::Rq);
let vmctx = GPR::Rq(VMCTX);
// TODO: Are globals necessarily aligned to 128 bits? We can load directly to an XMM reg if so
dynasm!(self.asm
; mov Rq(out.rq().unwrap()), [Rq(reg.unwrap_or(vmctx).rq().unwrap()) + offset as i32]
);
if let Some(reg) = reg {
self.block_state.regs.release(reg);
}
self.push(ValueLocation::Reg(out));
}
pub fn set_global(&mut self, global_idx: u32) {
let val = self.pop();
let (reg, offset) = self
.module_context
.defined_global_index(global_idx)
.map(|defined_global_index| {
(
None,
self.module_context
.vmctx_vmglobal_definition(defined_global_index),
)
})
.unwrap_or_else(|| {
let reg = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(reg.rq().unwrap()), [
Rq(VMCTX) +
self.module_context.vmctx_vmglobal_import_from(global_idx) as i32
]
);
(Some(reg), 0)
});
let val = self.into_reg(GPRType::Rq, val);
let vmctx = GPR::Rq(VMCTX);
// We always use `Rq` (even for floats) since the globals are not necessarily aligned to 128 bits
dynasm!(self.asm
; mov [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) + offset as i32
], Rq(val.rq().unwrap())
);
if let Some(reg) = reg {
self.block_state.regs.release(reg);
}
self.block_state.regs.release(val);
}
fn immediate_to_reg(&mut self, reg: GPR, val: Value) {
match reg {
GPR::Rq(r) => {
let val = val.as_bytes();
if (val as u64) <= u32::max_value() as u64 {
dynasm!(self.asm
; mov Rd(r), val as i32
);
} else {
dynasm!(self.asm
; mov Rq(r), QWORD val
);
}
}
GPR::Rx(r) => {
let temp = self.take_reg(I64);
self.immediate_to_reg(temp, val);
dynasm!(self.asm
; movq Rx(r), Rq(temp.rq().unwrap())
);
self.block_state.regs.release(temp);
}
}
}
// The `&` and `&mut` aren't necessary (`ValueLocation` is copy) but it ensures that we don't get
// the arguments the wrong way around. In the future we want to have a `ReadLocation` and `WriteLocation`
// so we statically can't write to a literal so this will become a non-issue.
fn copy_value(&mut self, src: ValueLocation, dst: CCLoc) {
match (src, dst) {
(ValueLocation::Cond(cond), CCLoc::Stack(o)) => {
let offset = self.adjusted_offset(o);
dynasm!(self.asm
; mov QWORD [rsp + offset], DWORD 0
);
match cond {
cc::EQUAL => dynasm!(self.asm
; sete [rsp + offset]
),
cc::NOT_EQUAL => dynasm!(self.asm
; setne [rsp + offset]
),
cc::GT_U => dynasm!(self.asm
; seta [rsp + offset]
),
cc::GE_U => dynasm!(self.asm
; setae [rsp + offset]
),
cc::LT_U => dynasm!(self.asm
; setb [rsp + offset]
),
cc::LE_U => dynasm!(self.asm
; setbe [rsp + offset]
),
cc::GT_S => dynasm!(self.asm
; setg [rsp + offset]
),
cc::GE_S => dynasm!(self.asm
; setge [rsp + offset]
),
cc::LT_S => dynasm!(self.asm
; setl [rsp + offset]
),
cc::LE_S => dynasm!(self.asm
; setle [rsp + offset]
),
}
}
(ValueLocation::Cond(cond), CCLoc::Reg(reg)) => match reg {
GPR::Rq(r) => {
dynasm!(self.asm
; mov Rq(r), 0
);
match cond {
cc::EQUAL => dynasm!(self.asm
; sete Rb(r)
),
cc::NOT_EQUAL => dynasm!(self.asm
; setne Rb(r)
),
cc::GT_U => dynasm!(self.asm
; seta Rb(r)
),
cc::GE_U => dynasm!(self.asm
; setae Rb(r)
),
cc::LT_U => dynasm!(self.asm
; setb Rb(r)
),
cc::LE_U => dynasm!(self.asm
; setbe Rb(r)
),
cc::GT_S => dynasm!(self.asm
; setg Rb(r)
),
cc::GE_S => dynasm!(self.asm
; setge Rb(r)
),
cc::LT_S => dynasm!(self.asm
; setl Rb(r)
),
cc::LE_S => dynasm!(self.asm
; setle Rb(r)
),
}
}
GPR::Rx(_) => {
let temp = CCLoc::Reg(self.take_reg(I32));
self.copy_value(src, temp);
let temp = temp.into();
self.copy_value(temp, dst);
self.free_value(temp);
}
},
(ValueLocation::Stack(in_offset), CCLoc::Stack(out_offset)) => {
let in_offset = self.adjusted_offset(in_offset);
let out_offset = self.adjusted_offset(out_offset);
if in_offset != out_offset {
let gpr = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(gpr.rq().unwrap()), [rsp + in_offset]
; mov [rsp + out_offset], Rq(gpr.rq().unwrap())
);
self.block_state.regs.release(gpr);
}
}
// TODO: XMM registers
(ValueLocation::Reg(in_reg), CCLoc::Stack(out_offset)) => {
let out_offset = self.adjusted_offset(out_offset);
match in_reg {
GPR::Rq(in_reg) => {
// We can always use `Rq` here for now because stack slots are in multiples of
// 8 bytes
dynasm!(self.asm
; mov [rsp + out_offset], Rq(in_reg)
);
}
GPR::Rx(in_reg) => {
// We can always use `movq` here for now because stack slots are in multiples of
// 8 bytes
dynasm!(self.asm
; movq [rsp + out_offset], Rx(in_reg)
);
}
}
}
(ValueLocation::Immediate(i), CCLoc::Stack(out_offset)) => {
// TODO: Floats
let i = i.as_bytes();
let out_offset = self.adjusted_offset(out_offset);
if (i as u64) <= u32::max_value() as u64 {
dynasm!(self.asm
; mov DWORD [rsp + out_offset], i as i32
);
} else {
let scratch = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(scratch.rq().unwrap()), QWORD i
; mov [rsp + out_offset], Rq(scratch.rq().unwrap())
);
self.block_state.regs.release(scratch);
}
}
(ValueLocation::Stack(in_offset), CCLoc::Reg(out_reg)) => {
let in_offset = self.adjusted_offset(in_offset);
match out_reg {
GPR::Rq(out_reg) => {
// We can always use `Rq` here for now because stack slots are in multiples of
// 8 bytes
dynasm!(self.asm
; mov Rq(out_reg), [rsp + in_offset]
);
}
GPR::Rx(out_reg) => {
// We can always use `movq` here for now because stack slots are in multiples of
// 8 bytes
dynasm!(self.asm
; movq Rx(out_reg), [rsp + in_offset]
);
}
}
}
(ValueLocation::Reg(in_reg), CCLoc::Reg(out_reg)) => {
if in_reg != out_reg {
match (in_reg, out_reg) {
(GPR::Rq(in_reg), GPR::Rq(out_reg)) => {
dynasm!(self.asm
; mov Rq(out_reg), Rq(in_reg)
);
}
(GPR::Rx(in_reg), GPR::Rq(out_reg)) => {
dynasm!(self.asm
; movq Rq(out_reg), Rx(in_reg)
);
}
(GPR::Rq(in_reg), GPR::Rx(out_reg)) => {
dynasm!(self.asm
; movq Rx(out_reg), Rq(in_reg)
);
}
(GPR::Rx(in_reg), GPR::Rx(out_reg)) => {
dynasm!(self.asm
; movapd Rx(out_reg), Rx(in_reg)
);
}
}
}
}
(ValueLocation::Immediate(i), CCLoc::Reg(out_reg)) => {
// TODO: Floats
self.immediate_to_reg(out_reg, i);
}
}
}
/// Define the given label at the current position.
///
/// Multiple labels can be defined at the same position. However, a label
/// can be defined only once.
pub fn define_label(&mut self, label: Label) {
self.asm.dynamic_label(label.0);
}
pub fn set_state(&mut self, state: VirtualCallingConvention) {
self.block_state.regs = Registers::new();
for elem in &state.stack {
if let ValueLocation::Reg(r) = elem {
self.block_state.regs.mark_used(*r);
}
}
self.block_state.stack = state.stack;
self.block_state.depth = state.depth;
}
pub fn apply_cc(&mut self, cc: &BlockCallingConvention) {
let stack = cc.arguments.iter();
self.block_state.stack = Vec::with_capacity(stack.size_hint().0);
self.block_state.regs = Registers::new();
for &elem in stack {
if let CCLoc::Reg(r) = elem {
self.block_state.regs.mark_used(r);
}
self.block_state.stack.push(elem.into());
}
self.block_state.depth = cc.stack_depth;
}
load!(i32_load, GPRType::Rq, Rd, movd, mov, DWORD);
load!(i64_load, GPRType::Rq, Rq, movq, mov, QWORD);
load!(f32_load, GPRType::Rx, Rd, movd, mov, DWORD);
load!(f64_load, GPRType::Rx, Rq, movq, mov, QWORD);
load!(i32_load8_u, GPRType::Rq, Rd, NONE, movzx, BYTE);
load!(i32_load8_s, GPRType::Rq, Rd, NONE, movsx, BYTE);
load!(i32_load16_u, GPRType::Rq, Rd, NONE, movzx, WORD);
load!(i32_load16_s, GPRType::Rq, Rd, NONE, movsx, WORD);
load!(i64_load8_u, GPRType::Rq, Rq, NONE, movzx, BYTE);
load!(i64_load8_s, GPRType::Rq, Rq, NONE, movsx, BYTE);
load!(i64_load16_u, GPRType::Rq, Rq, NONE, movzx, WORD);
load!(i64_load16_s, GPRType::Rq, Rq, NONE, movsx, WORD);
load!(i64_load32_u, GPRType::Rq, Rd, movd, mov, DWORD);
load!(i64_load32_s, GPRType::Rq, Rq, NONE, movsxd, DWORD);
store!(store8, Rb, NONE, DWORD);
store!(store16, Rw, NONE, QWORD);
store!(store32, Rd, movd, DWORD);
store!(store64, Rq, movq, QWORD);
fn push_physical(&mut self, value: ValueLocation) -> ValueLocation {
self.block_state.depth.reserve(1);
match value {
ValueLocation::Reg(_) | ValueLocation::Immediate(_) | ValueLocation::Cond(_) => {
let gpr = self.into_reg(GPRType::Rq, value);
dynasm!(self.asm
; push Rq(gpr.rq().unwrap())
);
self.block_state.regs.release(gpr);
}
ValueLocation::Stack(o) => {
let offset = self.adjusted_offset(o);
dynasm!(self.asm
; push QWORD [rsp + offset]
);
}
}
ValueLocation::Stack(-(self.block_state.depth.0 as i32))
}
fn push(&mut self, value: ValueLocation) {
if let Some(value) = self.block_state.stack.pop() {
let new = if let ValueLocation::Cond(_) = value {
ValueLocation::Reg(self.into_reg(I32, value))
} else {
value
};
self.block_state.stack.push(new);
}
self.block_state.stack.push(value);
}
fn pop(&mut self) -> ValueLocation {
self.block_state.stack.pop().expect("Stack is empty")
}
pub fn drop(&mut self, range: RangeInclusive<u32>) {
let mut repush = Vec::with_capacity(*range.start() as _);
for _ in 0..*range.start() {
repush.push(self.pop());
}
for _ in range {
let val = self.pop();
self.free_value(val);
}
for v in repush.into_iter().rev() {
self.push(v);
}
}
fn pop_into(&mut self, dst: CCLoc) {
let val = self.pop();
self.copy_value(val, dst);
self.free_value(val);
}
fn free_value(&mut self, val: ValueLocation) {
match val {
ValueLocation::Reg(r) => {
self.block_state.regs.release(r);
}
// TODO: Refcounted stack slots
_ => {}
}
}
/// Puts this value into a register so that it can be efficiently read
fn into_reg(&mut self, ty: impl Into<Option<GPRType>>, val: ValueLocation) -> GPR {
let out = self.to_reg(ty, val);
self.free_value(val);
out
}
/// Clones this value into a register so that it can be efficiently read
fn to_reg(&mut self, ty: impl Into<Option<GPRType>>, val: ValueLocation) -> GPR {
let ty = ty.into();
match val {
ValueLocation::Reg(r) if ty.map(|t| t == r.type_()).unwrap_or(true) => {
self.block_state.regs.mark_used(r);
r
}
val => {
let scratch = self.take_reg(ty.unwrap_or(GPRType::Rq));
self.copy_value(val, CCLoc::Reg(scratch));
scratch
}
}
}
/// Puts this value into a temporary register so that operations
/// on that register don't write to a local.
fn into_temp_reg(&mut self, ty: impl Into<Option<GPRType>>, val: ValueLocation) -> GPR {
let out = self.to_temp_reg(ty, val);
self.free_value(val);
out
}
/// Clones this value into a temporary register so that operations
/// on that register don't write to a local.
fn to_temp_reg(&mut self, ty: impl Into<Option<GPRType>>, val: ValueLocation) -> GPR {
// If we have `None` as the type then it always matches (`.unwrap_or(true)`)
match val {
ValueLocation::Reg(r) => {
let ty = ty.into();
let type_matches = ty.map(|t| t == r.type_()).unwrap_or(true);
if self.block_state.regs.num_usages(r) <= 1 && type_matches {
self.block_state.regs.mark_used(r);
r
} else {
let scratch = self.take_reg(ty.unwrap_or(GPRType::Rq));
self.copy_value(val, CCLoc::Reg(scratch));
scratch
}
}
val => self.to_reg(ty, val),
}
}
pub fn f32_neg(&mut self) {
let val = self.pop();
let out = if let Some(i) = val.imm_f32() {
ValueLocation::Immediate(
wasmparser::Ieee32((-f32::from_bits(i.bits())).to_bits()).into(),
)
} else {
let reg = self.into_temp_reg(GPRType::Rx, val);
let const_label = self.aligned_label(16, LabelValue::I32(SIGN_MASK_F32 as i32));
dynasm!(self.asm
; xorps Rx(reg.rx().unwrap()), [=>const_label.0]
);
ValueLocation::Reg(reg)
};
self.push(out);
}
pub fn f64_neg(&mut self) {
let val = self.pop();
let out = if let Some(i) = val.imm_f64() {
ValueLocation::Immediate(
wasmparser::Ieee64((-f64::from_bits(i.bits())).to_bits()).into(),
)
} else {
let reg = self.into_temp_reg(GPRType::Rx, val);
let const_label = self.aligned_label(16, LabelValue::I64(SIGN_MASK_F64 as i64));
dynasm!(self.asm
; xorpd Rx(reg.rx().unwrap()), [=>const_label.0]
);
ValueLocation::Reg(reg)
};
self.push(out);
}
pub fn f32_abs(&mut self) {
let val = self.pop();
let out = if let Some(i) = val.imm_f32() {
ValueLocation::Immediate(
wasmparser::Ieee32(f32::from_bits(i.bits()).abs().to_bits()).into(),
)
} else {
let reg = self.into_temp_reg(GPRType::Rx, val);
let const_label = self.aligned_label(16, LabelValue::I32(REST_MASK_F32 as i32));
dynasm!(self.asm
; andps Rx(reg.rx().unwrap()), [=>const_label.0]
);
ValueLocation::Reg(reg)
};
self.push(out);
}
pub fn f64_abs(&mut self) {
let val = self.pop();
let out = if let Some(i) = val.imm_f64() {
ValueLocation::Immediate(
wasmparser::Ieee64(f64::from_bits(i.bits()).abs().to_bits()).into(),
)
} else {
let reg = self.into_temp_reg(GPRType::Rx, val);
let const_label = self.aligned_label(16, LabelValue::I64(REST_MASK_F64 as i64));
dynasm!(self.asm
; andps Rx(reg.rx().unwrap()), [=>const_label.0]
);
ValueLocation::Reg(reg)
};
self.push(out);
}
pub fn f32_sqrt(&mut self) {
let val = self.pop();
let out = if let Some(i) = val.imm_f32() {
ValueLocation::Immediate(
wasmparser::Ieee32(f32::from_bits(i.bits()).sqrt().to_bits()).into(),
)
} else {
let reg = self.into_temp_reg(GPRType::Rx, val);
dynasm!(self.asm
; sqrtss Rx(reg.rx().unwrap()), Rx(reg.rx().unwrap())
);
ValueLocation::Reg(reg)
};
self.push(out);
}
pub fn f64_sqrt(&mut self) {
let val = self.pop();
let out = if let Some(i) = val.imm_f64() {
ValueLocation::Immediate(
wasmparser::Ieee64(f64::from_bits(i.bits()).sqrt().to_bits()).into(),
)
} else {
let reg = self.into_temp_reg(GPRType::Rx, val);
dynasm!(self.asm
; sqrtsd Rx(reg.rx().unwrap()), Rx(reg.rx().unwrap())
);
ValueLocation::Reg(reg)
};
self.push(out);
}
pub fn f32_copysign(&mut self) {
let right = self.pop();
let left = self.pop();
let out = if let (Some(left), Some(right)) = (left.imm_f32(), right.imm_f32()) {
ValueLocation::Immediate(
wasmparser::Ieee32((left.bits() & REST_MASK_F32) | (right.bits() & SIGN_MASK_F32))
.into(),
)
} else {
let left = self.into_temp_reg(GPRType::Rx, left);
let right = self.into_reg(GPRType::Rx, right);
let sign_mask = self.aligned_label(16, LabelValue::I32(SIGN_MASK_F32 as i32));
let rest_mask = self.aligned_label(16, LabelValue::I32(REST_MASK_F32 as i32));
dynasm!(self.asm
; andps Rx(right.rx().unwrap()), [=>sign_mask.0]
; andps Rx(left.rx().unwrap()), [=>rest_mask.0]
; orps Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
);
self.block_state.regs.release(right);
ValueLocation::Reg(left)
};
self.push(out);
}
pub fn f64_copysign(&mut self) {
let right = self.pop();
let left = self.pop();
let out = if let (Some(left), Some(right)) = (left.imm_f64(), right.imm_f64()) {
ValueLocation::Immediate(
wasmparser::Ieee64((left.bits() & REST_MASK_F64) | (right.bits() & SIGN_MASK_F64))
.into(),
)
} else {
let left = self.into_temp_reg(GPRType::Rx, left);
let right = self.into_reg(GPRType::Rx, right);
let sign_mask = self.aligned_label(16, LabelValue::I64(SIGN_MASK_F64 as i64));
let rest_mask = self.aligned_label(16, LabelValue::I64(REST_MASK_F64 as i64));
dynasm!(self.asm
; andpd Rx(right.rx().unwrap()), [=>sign_mask.0]
; andpd Rx(left.rx().unwrap()), [=>rest_mask.0]
; orpd Rx(left.rx().unwrap()), Rx(right.rx().unwrap())
);
self.block_state.regs.release(right);
ValueLocation::Reg(left)
};
self.push(out);
}
unop!(i32_clz, lzcnt, Rd, u32, u32::leading_zeros);
unop!(i64_clz, lzcnt, Rq, u64, |a: u64| a.leading_zeros() as u64);
unop!(i32_ctz, tzcnt, Rd, u32, u32::trailing_zeros);
unop!(i64_ctz, tzcnt, Rq, u64, |a: u64| a.trailing_zeros() as u64);
pub fn i32_extend_u(&mut self) {
let val = self.pop();
self.free_value(val);
let new_reg = self.take_reg(I64);
let out = if let ValueLocation::Immediate(imm) = val {
self.block_state.regs.release(new_reg);
ValueLocation::Immediate((imm.as_i32().unwrap() as u32 as u64).into())
} else {
match val {
ValueLocation::Reg(GPR::Rx(rxreg)) => {
dynasm!(self.asm
; movd Rd(new_reg.rq().unwrap()), Rx(rxreg)
);
}
ValueLocation::Reg(GPR::Rq(rqreg)) => {
dynasm!(self.asm
; mov Rd(new_reg.rq().unwrap()), Rd(rqreg)
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; mov Rd(new_reg.rq().unwrap()), [rsp + offset]
);
}
_ => unreachable!(),
}
ValueLocation::Reg(new_reg)
};
self.push(out);
}
pub fn i32_extend_s(&mut self) {
let val = self.pop();
self.free_value(val);
let new_reg = self.take_reg(I64);
let out = if let ValueLocation::Immediate(imm) = val {
self.block_state.regs.release(new_reg);
ValueLocation::Immediate((imm.as_i32().unwrap() as i64).into())
} else {
match val {
ValueLocation::Reg(GPR::Rx(rxreg)) => {
dynasm!(self.asm
; movd Rd(new_reg.rq().unwrap()), Rx(rxreg)
; movsxd Rq(new_reg.rq().unwrap()), Rd(new_reg.rq().unwrap())
);
}
ValueLocation::Reg(GPR::Rq(rqreg)) => {
dynasm!(self.asm
; movsxd Rq(new_reg.rq().unwrap()), Rd(rqreg)
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; movsxd Rq(new_reg.rq().unwrap()), DWORD [rsp + offset]
);
}
_ => unreachable!(),
}
ValueLocation::Reg(new_reg)
};
self.push(out);
}
unop!(i32_popcnt, popcnt, Rd, u32, u32::count_ones);
conversion!(
f64_from_f32,
cvtss2sd,
Rx,
rx,
Rx,
rx,
f32,
f64,
as_f32,
|a: wasmparser::Ieee32| wasmparser::Ieee64((f32::from_bits(a.bits()) as f64).to_bits())
);
conversion!(
f32_from_f64,
cvtsd2ss,
Rx,
rx,
Rx,
rx,
f64,
f32,
as_f64,
|a: wasmparser::Ieee64| wasmparser::Ieee32((f64::from_bits(a.bits()) as f32).to_bits())
);
pub fn i32_truncate_f32_s(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f32::from_bits(imm.as_f32().unwrap().bits()) as i32).into(),
),
other => {
let reg = self.into_reg(F32, other);
let temp = self.take_reg(I32);
val = ValueLocation::Reg(reg);
let sign_mask = self.aligned_label(4, LabelValue::I32(SIGN_MASK_F32 as i32));
let float_cmp_mask = self.aligned_label(16, LabelValue::I32(0xcf000000u32 as i32));
let zero = self.aligned_label(16, LabelValue::I32(0));
let trap_label = self.trap_label();
dynasm!(self.asm
; cvttss2si Rd(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; cmp Rd(temp.rq().unwrap()), [=>sign_mask.0]
; jne >ret
; ucomiss Rx(reg.rx().unwrap()), Rx(reg.rx().unwrap())
; jp =>trap_label.0
; ucomiss Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; jnae =>trap_label.0
; ucomiss Rx(reg.rx().unwrap()), [=>zero.0]
; jnb =>trap_label.0
; ret:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i32_truncate_f32_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f32::from_bits(imm.as_f32().unwrap().bits()) as i32).into(),
),
other => {
let reg = self.into_temp_reg(F32, other);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(I32);
let sign_mask = self.aligned_label(4, LabelValue::I32(SIGN_MASK_F32 as i32));
let float_cmp_mask = self.aligned_label(16, LabelValue::I32(0x4f000000u32 as i32));
let trap_label = self.trap_label();
dynasm!(self.asm
; ucomiss Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; jae >else_
; jp =>trap_label.0
; cvttss2si Rd(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; test Rd(temp.rq().unwrap()), Rd(temp.rq().unwrap())
; js =>trap_label.0
; jmp >ret
; else_:
; subss Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; cvttss2si Rd(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; test Rd(temp.rq().unwrap()), Rd(temp.rq().unwrap())
; js =>trap_label.0
; add Rq(temp.rq().unwrap()), [=>sign_mask.0]
; ret:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i32_truncate_f64_s(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f64::from_bits(imm.as_f64().unwrap().bits()) as i32).into(),
),
other => {
let reg = self.into_reg(F32, other);
let temp = self.take_reg(I32);
val = ValueLocation::Reg(reg);
let sign_mask = self.aligned_label(4, LabelValue::I32(SIGN_MASK_F32 as i32));
let float_cmp_mask =
self.aligned_label(16, LabelValue::I64(0xc1e0000000200000u64 as i64));
let zero = self.aligned_label(16, LabelValue::I64(0));
let trap_label = self.trap_label();
dynasm!(self.asm
; cvttsd2si Rd(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; cmp Rd(temp.rq().unwrap()), [=>sign_mask.0]
; jne >ret
; ucomisd Rx(reg.rx().unwrap()), Rx(reg.rx().unwrap())
; jp =>trap_label.0
; ucomisd Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; jna =>trap_label.0
; ucomisd Rx(reg.rx().unwrap()), [=>zero.0]
; jnb =>trap_label.0
; ret:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i32_truncate_f64_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f32::from_bits(imm.as_f32().unwrap().bits()) as i32).into(),
),
other => {
let reg = self.into_temp_reg(F32, other);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(I32);
let sign_mask = self.aligned_label(4, LabelValue::I32(SIGN_MASK_F32 as i32));
let float_cmp_mask =
self.aligned_label(16, LabelValue::I64(0x41e0000000000000u64 as i64));
let trap_label = self.trap_label();
dynasm!(self.asm
; ucomisd Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; jae >else_
; jp =>trap_label.0
; cvttsd2si Rd(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; test Rd(temp.rq().unwrap()), Rd(temp.rq().unwrap())
; js =>trap_label.0
; jmp >ret
; else_:
; subsd Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; cvttsd2si Rd(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; test Rd(temp.rq().unwrap()), Rd(temp.rq().unwrap())
; js =>trap_label.0
; add Rq(temp.rq().unwrap()), [=>sign_mask.0]
; ret:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
conversion!(
f32_convert_from_i32_s,
cvtsi2ss,
Rd,
rq,
Rx,
rx,
i32,
f32,
as_i32,
|a| wasmparser::Ieee32((a as f32).to_bits())
);
conversion!(
f64_convert_from_i32_s,
cvtsi2sd,
Rd,
rq,
Rx,
rx,
i32,
f64,
as_i32,
|a| wasmparser::Ieee64((a as f64).to_bits())
);
conversion!(
f32_convert_from_i64_s,
cvtsi2ss,
Rq,
rq,
Rx,
rx,
i64,
f32,
as_i32,
|a| wasmparser::Ieee32((a as f32).to_bits())
);
conversion!(
f64_convert_from_i64_s,
cvtsi2sd,
Rq,
rq,
Rx,
rx,
i64,
f64,
as_i32,
|a| wasmparser::Ieee64((a as f64).to_bits())
);
pub fn i64_truncate_f32_s(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f32::from_bits(imm.as_f32().unwrap().bits()) as i32).into(),
),
other => {
let reg = self.into_temp_reg(F32, other);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(I32);
let sign_mask = self.aligned_label(16, LabelValue::I64(SIGN_MASK_F64 as i64));
let float_cmp_mask = self.aligned_label(16, LabelValue::I32(0xdf000000u32 as i32));
let zero = self.aligned_label(16, LabelValue::I64(0));
let trap_label = self.trap_label();
dynasm!(self.asm
; cvttss2si Rq(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; cmp Rq(temp.rq().unwrap()), [=>sign_mask.0]
; jne >ret
; ucomiss Rx(reg.rx().unwrap()), Rx(reg.rx().unwrap())
; jp =>trap_label.0
; ucomiss Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; jnae =>trap_label.0
; ucomiss Rx(reg.rx().unwrap()), [=>zero.0]
; jnb =>trap_label.0
; ret:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i64_truncate_f64_s(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f64::from_bits(imm.as_f64().unwrap().bits()) as i32).into(),
),
other => {
let reg = self.into_reg(F32, other);
let temp = self.take_reg(I32);
val = ValueLocation::Reg(reg);
let sign_mask = self.aligned_label(8, LabelValue::I64(SIGN_MASK_F64 as i64));
let float_cmp_mask =
self.aligned_label(16, LabelValue::I64(0xc3e0000000000000u64 as i64));
let zero = self.aligned_label(16, LabelValue::I64(0));
let trap_label = self.trap_label();
dynasm!(self.asm
; cvttsd2si Rq(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; cmp Rq(temp.rq().unwrap()), [=>sign_mask.0]
; jne >ret
; ucomisd Rx(reg.rx().unwrap()), Rx(reg.rx().unwrap())
; jp =>trap_label.0
; ucomisd Rx(reg.rx().unwrap()), [=>float_cmp_mask.0]
; jnae =>trap_label.0
; ucomisd Rx(reg.rx().unwrap()), [=>zero.0]
; jnb =>trap_label.0
; ret:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i64_truncate_f32_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f32::from_bits(imm.as_f32().unwrap().bits()) as u64).into(),
),
_ => {
let reg = self.into_reg(F32, val);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(I64);
let sign_mask = self.aligned_label(16, LabelValue::I64(SIGN_MASK_F64 as i64));
let u64_trunc_f32_const = self.aligned_label(16, LabelValue::I32(0x5F000000));
let trap_label = self.trap_label();
dynasm!(self.asm
; comiss Rx(reg.rx().unwrap()), [=>u64_trunc_f32_const.0]
; jae >large
; jp =>trap_label.0
; cvttss2si Rq(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; test Rq(temp.rq().unwrap()), Rq(temp.rq().unwrap())
; js =>trap_label.0
; jmp >cont
; large:
; subss Rx(reg.rx().unwrap()), [=>u64_trunc_f32_const.0]
; cvttss2si Rq(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; test Rq(temp.rq().unwrap()), Rq(temp.rq().unwrap())
; js =>trap_label.0
; add Rq(temp.rq().unwrap()), [=>sign_mask.0]
; cont:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i64_truncate_f64_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
(f64::from_bits(imm.as_f64().unwrap().bits()) as u64).into(),
),
_ => {
let reg = self.into_reg(F64, val);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(I64);
let sign_mask = self.aligned_label(16, LabelValue::I64(SIGN_MASK_F64 as i64));
let u64_trunc_f64_const =
self.aligned_label(16, LabelValue::I64(0x43e0000000000000));
let trap_label = self.trap_label();
dynasm!(self.asm
; comisd Rx(reg.rx().unwrap()), [=>u64_trunc_f64_const.0]
; jnb >large
; jp =>trap_label.0
; cvttsd2si Rq(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; cmp Rq(temp.rq().unwrap()), 0
; jge >cont
; jmp =>trap_label.0
; large:
; subsd Rx(reg.rx().unwrap()), [=>u64_trunc_f64_const.0]
; cvttsd2si Rq(temp.rq().unwrap()), Rx(reg.rx().unwrap())
; cmp Rq(temp.rq().unwrap()), 0
; jnge =>trap_label.0
; add Rq(temp.rq().unwrap()), [=>sign_mask.0]
; cont:
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn f32_convert_from_i32_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
wasmparser::Ieee32((imm.as_i32().unwrap() as u32 as f32).to_bits()).into(),
),
_ => {
let reg = self.into_reg(I32, val);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(F32);
dynasm!(self.asm
; mov Rd(reg.rq().unwrap()), Rd(reg.rq().unwrap())
; cvtsi2ss Rx(temp.rx().unwrap()), Rq(reg.rq().unwrap())
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn f64_convert_from_i32_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
wasmparser::Ieee64((imm.as_i32().unwrap() as u32 as f64).to_bits()).into(),
),
_ => {
let reg = self.into_reg(I32, val);
val = ValueLocation::Reg(reg);
let temp = self.take_reg(F64);
dynasm!(self.asm
; mov Rd(reg.rq().unwrap()), Rd(reg.rq().unwrap())
; cvtsi2sd Rx(temp.rx().unwrap()), Rq(reg.rq().unwrap())
);
ValueLocation::Reg(temp)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn f32_convert_from_i64_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
wasmparser::Ieee32((imm.as_i32().unwrap() as u64 as f32).to_bits()).into(),
),
_ => {
let reg = self.into_reg(I64, val);
val = ValueLocation::Reg(reg);
let out = self.take_reg(F32);
let temp = self.take_reg(I64);
dynasm!(self.asm
; test Rq(reg.rq().unwrap()), Rq(reg.rq().unwrap())
; js >negative
; cvtsi2ss Rx(out.rx().unwrap()), Rq(reg.rq().unwrap())
; jmp >ret
; negative:
; mov Rq(temp.rq().unwrap()), Rq(reg.rq().unwrap())
; shr Rq(temp.rq().unwrap()), 1
; and Rq(reg.rq().unwrap()), 1
; or Rq(reg.rq().unwrap()), Rq(temp.rq().unwrap())
; cvtsi2ss Rx(out.rx().unwrap()), Rq(reg.rq().unwrap())
; addss Rx(out.rx().unwrap()), Rx(out.rx().unwrap())
; ret:
);
self.free_value(ValueLocation::Reg(temp));
ValueLocation::Reg(out)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn f64_convert_from_i64_u(&mut self) {
let mut val = self.pop();
let out_val = match val {
ValueLocation::Immediate(imm) => ValueLocation::Immediate(
wasmparser::Ieee64((imm.as_i64().unwrap() as u64 as f64).to_bits()).into(),
),
_ => {
let reg = self.into_reg(I64, val);
val = ValueLocation::Reg(reg);
let out = self.take_reg(F32);
let temp = self.take_reg(I64);
dynasm!(self.asm
; test Rq(reg.rq().unwrap()), Rq(reg.rq().unwrap())
; js >negative
; cvtsi2sd Rx(out.rx().unwrap()), Rq(reg.rq().unwrap())
; jmp >ret
; negative:
; mov Rq(temp.rq().unwrap()), Rq(reg.rq().unwrap())
; shr Rq(temp.rq().unwrap()), 1
; and Rq(reg.rq().unwrap()), 1
; or Rq(reg.rq().unwrap()), Rq(temp.rq().unwrap())
; cvtsi2sd Rx(out.rx().unwrap()), Rq(reg.rq().unwrap())
; addsd Rx(out.rx().unwrap()), Rx(out.rx().unwrap())
; ret:
);
self.free_value(ValueLocation::Reg(temp));
ValueLocation::Reg(out)
}
};
self.free_value(val);
self.push(out_val);
}
pub fn i32_reinterpret_from_f32(&mut self) {
let val = self.pop();
let out = match val {
ValueLocation::Immediate(imm) => {
ValueLocation::Immediate(imm.as_f32().unwrap().bits().into())
}
val => val,
};
self.push(out);
}
pub fn i64_reinterpret_from_f64(&mut self) {
let val = self.pop();
let out = match val {
ValueLocation::Immediate(imm) => {
ValueLocation::Immediate(imm.as_f64().unwrap().bits().into())
}
val => val,
};
self.push(out);
}
pub fn f32_reinterpret_from_i32(&mut self) {
let val = self.pop();
let out = match val {
ValueLocation::Immediate(imm) => {
ValueLocation::Immediate(wasmparser::Ieee32(imm.as_i32().unwrap() as _).into())
}
val => val,
};
self.push(out);
}
pub fn f64_reinterpret_from_i64(&mut self) {
let val = self.pop();
let out = match val {
ValueLocation::Immediate(imm) => {
ValueLocation::Immediate(wasmparser::Ieee64(imm.as_i64().unwrap() as _).into())
}
val => val,
};
self.push(out);
}
unop!(i64_popcnt, popcnt, Rq, u64, |a: u64| a.count_ones() as u64);
// TODO: Use `lea` when the LHS operand isn't a temporary but both of the operands
// are in registers.
commutative_binop_i32!(i32_add, add, i32::wrapping_add);
commutative_binop_i32!(i32_and, and, |a, b| a & b);
commutative_binop_i32!(i32_or, or, |a, b| a | b);
commutative_binop_i32!(i32_xor, xor, |a, b| a ^ b);
binop_i32!(i32_sub, sub, i32::wrapping_sub);
commutative_binop_i64!(i64_add, add, i64::wrapping_add);
commutative_binop_i64!(i64_and, and, |a, b| a & b);
commutative_binop_i64!(i64_or, or, |a, b| a | b);
commutative_binop_i64!(i64_xor, xor, |a, b| a ^ b);
binop_i64!(i64_sub, sub, i64::wrapping_sub);
commutative_binop_f32!(f32_add, addss, |a, b| a + b);
commutative_binop_f32!(f32_mul, mulss, |a, b| a * b);
minmax_float!(
f32_min,
minss,
ucomiss,
addss,
orps,
as_f32,
|a: wasmparser::Ieee32, b: wasmparser::Ieee32| wasmparser::Ieee32(
f32::from_bits(a.0).min(f32::from_bits(b.0)).to_bits()
)
);
minmax_float!(
f32_max,
maxss,
ucomiss,
addss,
andps,
as_f32,
|a: wasmparser::Ieee32, b: wasmparser::Ieee32| wasmparser::Ieee32(
f32::from_bits(a.0).max(f32::from_bits(b.0)).to_bits()
)
);
binop_f32!(f32_sub, subss, |a, b| a - b);
binop_f32!(f32_div, divss, |a, b| a / b);
pub fn f32_ceil(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::CeilF32),
iter::once(F32),
iter::once(F32),
true,
);
}
pub fn f32_floor(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::FloorF32),
iter::once(F32),
iter::once(F32),
true,
);
}
pub fn f32_nearest(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::NearestF32),
iter::once(F32),
iter::once(F32),
true,
);
}
pub fn f32_trunc(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::TruncF32),
iter::once(F32),
iter::once(F32),
true,
);
}
commutative_binop_f64!(f64_add, addsd, |a, b| a + b);
commutative_binop_f64!(f64_mul, mulsd, |a, b| a * b);
minmax_float!(
f64_min,
minsd,
ucomisd,
addsd,
orpd,
as_f64,
|a: wasmparser::Ieee64, b: wasmparser::Ieee64| wasmparser::Ieee64(
f64::from_bits(a.0).min(f64::from_bits(b.0)).to_bits()
)
);
minmax_float!(
f64_max,
maxsd,
ucomisd,
addsd,
andpd,
as_f64,
|a: wasmparser::Ieee64, b: wasmparser::Ieee64| wasmparser::Ieee64(
f64::from_bits(a.0).max(f64::from_bits(b.0)).to_bits()
)
);
binop_f64!(f64_sub, subsd, |a, b| a - b);
binop_f64!(f64_div, divsd, |a, b| a / b);
pub fn f64_ceil(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::CeilF64),
iter::once(F64),
iter::once(F64),
true,
);
}
pub fn f64_floor(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::FloorF64),
iter::once(F64),
iter::once(F64),
true,
);
}
pub fn f64_nearest(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::NearestF64),
iter::once(F64),
iter::once(F64),
true,
);
}
pub fn f64_trunc(&mut self) {
self.relocated_function_call(
&ir::ExternalName::LibCall(ir::LibCall::TruncF64),
iter::once(F64),
iter::once(F64),
true,
);
}
shift!(
i32_shl,
Rd,
shl,
|a, b| (a as i32).wrapping_shl(b as _),
I32
);
shift!(
i32_shr_s,
Rd,
sar,
|a, b| (a as i32).wrapping_shr(b as _),
I32
);
shift!(
i32_shr_u,
Rd,
shr,
|a, b| (a as u32).wrapping_shr(b as _),
I32
);
shift!(
i32_rotl,
Rd,
rol,
|a, b| (a as u32).rotate_left(b as _),
I32
);
shift!(
i32_rotr,
Rd,
ror,
|a, b| (a as u32).rotate_right(b as _),
I32
);
shift!(
i64_shl,
Rq,
shl,
|a, b| (a as i64).wrapping_shl(b as _),
I64
);
shift!(
i64_shr_s,
Rq,
sar,
|a, b| (a as i64).wrapping_shr(b as _),
I64
);
shift!(
i64_shr_u,
Rq,
shr,
|a, b| (a as u64).wrapping_shr(b as _),
I64
);
shift!(
i64_rotl,
Rq,
rol,
|a, b| (a as u64).rotate_left(b as _),
I64
);
shift!(
i64_rotr,
Rq,
ror,
|a, b| (a as u64).rotate_right(b as _),
I64
);
fn cleanup_gprs(&mut self, gprs: impl Iterator<Item = (GPR, GPR)>) {
for (src, dst) in gprs {
self.copy_value(ValueLocation::Reg(src), CCLoc::Reg(dst));
self.block_state.regs.release(src);
self.block_state.regs.mark_used(dst);
}
}
int_div!(
i32_full_div_s,
i32_full_div_u,
i32_div_u,
i32_div_s,
i32_rem_u,
i32_rem_s,
imm_i32,
i32,
u32
);
int_div!(
i64_full_div_s,
i64_full_div_u,
i64_div_u,
i64_div_s,
i64_rem_u,
i64_rem_s,
imm_i64,
i64,
u64
);
/// Returned divisor is guaranteed not to be `RAX`
// TODO: With a proper SSE-like "Value" system we could do this way better (we wouldn't have
// to move `RAX` back afterwards).
fn full_div(
&mut self,
divisor: ValueLocation,
quotient: ValueLocation,
do_div: impl FnOnce(&mut Self, ValueLocation),
) -> (
ValueLocation,
ValueLocation,
impl Iterator<Item = (GPR, GPR)> + Clone + 'this,
) {
self.block_state.regs.mark_used(RAX);
self.block_state.regs.mark_used(RDX);
let divisor = if divisor == ValueLocation::Reg(RAX) || divisor == ValueLocation::Reg(RDX) {
let new_reg = self.take_reg(I32);
self.copy_value(divisor, CCLoc::Reg(new_reg));
self.free_value(divisor);
ValueLocation::Reg(new_reg)
} else if let ValueLocation::Stack(_) = divisor {
divisor
} else {
ValueLocation::Reg(self.into_reg(I32, divisor))
};
self.block_state.regs.release(RDX);
self.block_state.regs.release(RAX);
if let ValueLocation::Reg(r) = quotient {
self.block_state.regs.mark_used(r);
}
let should_save_rax =
quotient != ValueLocation::Reg(RAX) && !self.block_state.regs.is_free(RAX);
let saved_rax = if should_save_rax {
let new_reg = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new_reg.rq().unwrap()), rax
);
Some(new_reg)
} else {
None
};
self.block_state.regs.mark_used(RAX);
self.copy_value(quotient, CCLoc::Reg(RAX));
self.free_value(quotient);
let should_save_rdx = !self.block_state.regs.is_free(RDX);
let saved_rdx = if should_save_rdx {
let new_reg = self.take_reg(I32);
dynasm!(self.asm
; mov Rq(new_reg.rq().unwrap()), rdx
);
Some(new_reg)
} else {
None
};
do_div(self, divisor);
self.free_value(divisor);
self.block_state.regs.mark_used(RDX);
(
ValueLocation::Reg(RAX),
ValueLocation::Reg(RDX),
saved_rax
.map(|s| (s, RAX))
.into_iter()
.chain(saved_rdx.map(|s| (s, RDX))),
)
}
fn i32_full_div_u(
&mut self,
divisor: ValueLocation,
quotient: ValueLocation,
) -> (
ValueLocation,
ValueLocation,
impl Iterator<Item = (GPR, GPR)> + Clone + 'this,
) {
self.full_div(divisor, quotient, |this, divisor| match divisor {
ValueLocation::Stack(offset) => {
let offset = this.adjusted_offset(offset);
dynasm!(this.asm
; xor edx, edx
; div DWORD [rsp + offset]
);
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let r = this.into_reg(I32, divisor);
dynasm!(this.asm
; xor edx, edx
; div Rd(r.rq().unwrap())
);
}
ValueLocation::Immediate(_) => unreachable!(),
})
}
fn i32_full_div_s(
&mut self,
divisor: ValueLocation,
quotient: ValueLocation,
) -> (
ValueLocation,
ValueLocation,
impl Iterator<Item = (GPR, GPR)> + Clone + 'this,
) {
self.full_div(divisor, quotient, |this, divisor| match divisor {
ValueLocation::Stack(offset) => {
let offset = this.adjusted_offset(offset);
dynasm!(this.asm
; cdq
; idiv DWORD [rsp + offset]
);
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let r = this.into_reg(I32, divisor);
dynasm!(this.asm
; cdq
; idiv Rd(r.rq().unwrap())
);
}
ValueLocation::Immediate(_) => unreachable!(),
})
}
fn i64_full_div_u(
&mut self,
divisor: ValueLocation,
quotient: ValueLocation,
) -> (
ValueLocation,
ValueLocation,
impl Iterator<Item = (GPR, GPR)> + Clone + 'this,
) {
self.full_div(divisor, quotient, |this, divisor| match divisor {
ValueLocation::Stack(offset) => {
let offset = this.adjusted_offset(offset);
dynasm!(this.asm
; xor rdx, rdx
; div QWORD [rsp + offset]
);
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let r = this.into_reg(I64, divisor);
dynasm!(this.asm
; xor rdx, rdx
; div Rq(r.rq().unwrap())
);
}
ValueLocation::Immediate(_) => unreachable!(),
})
}
fn i64_full_div_s(
&mut self,
divisor: ValueLocation,
quotient: ValueLocation,
) -> (
ValueLocation,
ValueLocation,
impl Iterator<Item = (GPR, GPR)> + Clone + 'this,
) {
self.full_div(divisor, quotient, |this, divisor| match divisor {
ValueLocation::Stack(offset) => {
let offset = this.adjusted_offset(offset);
dynasm!(this.asm
; cqo
; idiv QWORD [rsp + offset]
);
}
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let r = this.into_reg(I64, divisor);
dynasm!(this.asm
; cqo
; idiv Rq(r.rq().unwrap())
);
}
ValueLocation::Immediate(_) => unreachable!(),
})
}
// `i32_mul` needs to be separate because the immediate form of the instruction
// has a different syntax to the immediate form of the other instructions.
pub fn i32_mul(&mut self) {
let right = self.pop();
let left = self.pop();
if let Some(right) = right.immediate() {
if let Some(left) = left.immediate() {
self.push(ValueLocation::Immediate(
i32::wrapping_mul(right.as_i32().unwrap(), left.as_i32().unwrap()).into(),
));
return;
}
}
let (left, right) = match left {
ValueLocation::Reg(_) => (left, right),
_ => {
if right.immediate().is_some() {
(left, right)
} else {
(right, left)
}
}
};
let out = match right {
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let right = self.into_reg(I32, right);
let left = self.into_temp_reg(I32, left);
dynasm!(self.asm
; imul Rd(left.rq().unwrap()), Rd(right.rq().unwrap())
);
left
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
let left = self.into_temp_reg(I32, left);
dynasm!(self.asm
; imul Rd(left.rq().unwrap()), [rsp + offset]
);
left
}
ValueLocation::Immediate(i) => {
let left = self.into_reg(I32, left);
self.block_state.regs.release(left);
let new_reg = self.take_reg(I32);
dynasm!(self.asm
; imul Rd(new_reg.rq().unwrap()), Rd(left.rq().unwrap()), i.as_i32().unwrap()
);
new_reg
}
};
self.push(ValueLocation::Reg(out));
self.free_value(right);
}
// `i64_mul` needs to be separate because the immediate form of the instruction
// has a different syntax to the immediate form of the other instructions.
pub fn i64_mul(&mut self) {
let right = self.pop();
let left = self.pop();
if let Some(right) = right.immediate() {
if let Some(left) = left.immediate() {
self.push(ValueLocation::Immediate(
i64::wrapping_mul(right.as_i64().unwrap(), left.as_i64().unwrap()).into(),
));
return;
}
}
let (left, right) = match left {
ValueLocation::Reg(_) => (left, right),
_ => {
if right.immediate().is_some() {
(left, right)
} else {
(right, left)
}
}
};
let out = match right {
ValueLocation::Reg(_) | ValueLocation::Cond(_) => {
let right = self.into_reg(I64, right);
let left = self.into_temp_reg(I64, left);
dynasm!(self.asm
; imul Rq(left.rq().unwrap()), Rq(right.rq().unwrap())
);
left
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
let left = self.into_temp_reg(I64, left);
dynasm!(self.asm
; imul Rq(left.rq().unwrap()), [rsp + offset]
);
left
}
ValueLocation::Immediate(i) => {
let left = self.into_reg(I64, left);
self.block_state.regs.release(left);
let new_reg = self.take_reg(I64);
let i = i.as_i64().unwrap();
if let Some(i) = i.try_into() {
dynasm!(self.asm
; imul Rq(new_reg.rq().unwrap()), Rq(left.rq().unwrap()), i
);
} else {
unimplemented!();
}
new_reg
}
};
self.push(ValueLocation::Reg(out));
self.free_value(right);
}
pub fn select(&mut self) {
let cond = self.pop();
let else_ = self.pop();
let then = self.pop();
if let ValueLocation::Immediate(i) = cond {
if i.as_i32().unwrap() == 0 {
self.push(else_);
} else {
self.push(then);
}
return;
}
let cond_reg = self.into_reg(I32, cond);
let else_ = if let ValueLocation::Stack(_) = else_ {
else_
} else {
ValueLocation::Reg(self.into_reg(I32, else_))
};
let then = if let ValueLocation::Stack(_) = then {
then
} else {
ValueLocation::Reg(self.into_reg(I32, then))
};
dynasm!(self.asm
; test Rd(cond_reg.rq().unwrap()), Rd(cond_reg.rq().unwrap())
);
self.block_state.regs.release(cond_reg);
let out_gpr = match (then, else_) {
(ValueLocation::Reg(then_reg), else_)
if self.block_state.regs.num_usages(then_reg) <= 1 =>
{
match else_ {
ValueLocation::Reg(reg) => {
dynasm!(self.asm
; cmovz Rq(then_reg.rq().unwrap()), Rq(reg.rq().unwrap())
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmovz Rq(then_reg.rq().unwrap()), [rsp + offset]
);
}
_ => unreachable!(),
}
self.free_value(else_);
then_reg
}
(then, ValueLocation::Reg(else_reg))
if self.block_state.regs.num_usages(else_reg) <= 1 =>
{
match then {
ValueLocation::Reg(reg) => {
dynasm!(self.asm
; cmovnz Rq(else_reg.rq().unwrap()), Rq(reg.rq().unwrap())
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmovnz Rq(else_reg.rq().unwrap()), [rsp + offset]
);
}
_ => unreachable!(),
}
self.free_value(then);
else_reg
}
(then, else_) => {
let out = self.take_reg(GPRType::Rq);
match else_ {
ValueLocation::Reg(reg) => {
dynasm!(self.asm
; cmovz Rq(out.rq().unwrap()), Rq(reg.rq().unwrap())
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmovz Rq(out.rq().unwrap()), [rsp + offset]
);
}
_ => unreachable!(),
}
match then {
ValueLocation::Reg(reg) => {
dynasm!(self.asm
; cmovnz Rq(out.rq().unwrap()), Rq(reg.rq().unwrap())
);
}
ValueLocation::Stack(offset) => {
let offset = self.adjusted_offset(offset);
dynasm!(self.asm
; cmovnz Rq(out.rq().unwrap()), [rsp + offset]
);
}
_ => unreachable!(),
}
self.free_value(then);
self.free_value(else_);
out
}
};
self.push(ValueLocation::Reg(out_gpr));
}
pub fn pick(&mut self, depth: u32) {
let idx = self.block_state.stack.len() - 1 - depth as usize;
let v = self.block_state.stack[idx];
match v {
ValueLocation::Reg(r) => {
self.block_state.regs.mark_used(r);
}
_ => {}
}
self.block_state.stack.push(v);
}
pub fn const_(&mut self, imm: Value) {
self.push(ValueLocation::Immediate(imm));
}
fn relocated_function_call(
&mut self,
name: &cranelift_codegen::ir::ExternalName,
args: impl IntoIterator<Item = SignlessType>,
rets: impl IntoIterator<Item = SignlessType>,
preserve_vmctx: bool,
) {
let locs = arg_locs(args);
self.save_volatile(locs.len()..);
if preserve_vmctx {
self.block_state.depth.reserve(1);
dynasm!(self.asm
; push Rq(VMCTX)
);
}
let depth = self.block_state.depth.clone();
self.pass_outgoing_args(&locs);
// 2 bytes for the 64-bit `mov` opcode + register ident, the rest is the immediate
self.reloc_sink.reloc_external(
(self.asm.offset().0
- self.func_starts[self.current_function as usize]
.0
.unwrap()
.0) as u32
+ 2,
binemit::Reloc::Abs8,
name,
0,
);
let temp = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(temp.rq().unwrap()), QWORD 0xdeadbeefdeadbeefu64 as i64
; call Rq(temp.rq().unwrap())
);
self.block_state.regs.release(temp);
for i in locs {
self.free_value(i.into());
}
self.push_function_returns(rets);
if preserve_vmctx {
self.set_stack_depth(depth);
dynasm!(self.asm
; pop Rq(VMCTX)
);
self.block_state.depth.free(1);
}
}
// TODO: Other memory indices
pub fn memory_size(&mut self) {
let memory_index = 0;
if let Some(defined_memory_index) = self.module_context.defined_memory_index(memory_index) {
self.push(ValueLocation::Immediate(defined_memory_index.into()));
self.relocated_function_call(
&magic::get_memory32_size_name(),
iter::once(I32),
iter::once(I32),
true,
);
} else {
self.push(ValueLocation::Immediate(memory_index.into()));
self.relocated_function_call(
&magic::get_imported_memory32_size_name(),
iter::once(I32),
iter::once(I32),
true,
);
}
}
// TODO: Other memory indices
pub fn memory_grow(&mut self) {
let memory_index = 0;
if let Some(defined_memory_index) = self.module_context.defined_memory_index(memory_index) {
self.push(ValueLocation::Immediate(defined_memory_index.into()));
self.relocated_function_call(
&magic::get_memory32_grow_name(),
iter::once(I32).chain(iter::once(I32)),
iter::once(I32),
true,
);
} else {
self.push(ValueLocation::Immediate(memory_index.into()));
self.relocated_function_call(
&magic::get_imported_memory32_grow_name(),
iter::once(I32).chain(iter::once(I32)),
iter::once(I32),
true,
);
}
}
// TODO: Use `ArrayVec`?
// TODO: This inefficiently duplicates registers but it's not really possible
// to double up stack space right now.
/// Saves volatile (i.e. caller-saved) registers before a function call, if they are used.
fn save_volatile(&mut self, bounds: impl std::ops::RangeBounds<usize>) {
self.save_regs(SCRATCH_REGS, bounds);
}
fn save_regs<I>(&mut self, regs: &I, bounds: impl std::ops::RangeBounds<usize>)
where
for<'a> &'a I: IntoIterator<Item = &'a GPR>,
I: ?Sized,
{
use std::ops::Bound::*;
let mut stack = mem::replace(&mut self.block_state.stack, vec![]);
let (start, end) = (
match bounds.end_bound() {
Unbounded => 0,
Included(v) => stack.len() - 1 - v,
Excluded(v) => stack.len() - v,
},
match bounds.start_bound() {
Unbounded => stack.len(),
Included(v) => stack.len() - v,
Excluded(v) => stack.len() - 1 - v,
},
);
for val in stack[start..end].iter_mut() {
if let ValueLocation::Reg(vreg) = *val {
if regs.into_iter().any(|r| *r == vreg) {
*val = self.push_physical(*val);
}
}
}
mem::replace(&mut self.block_state.stack, stack);
}
/// Write the arguments to the callee to the registers and the stack using the SystemV
/// calling convention.
fn pass_outgoing_args(&mut self, out_locs: &[CCLoc]) {
// TODO: Do alignment here
let total_stack_space = out_locs
.iter()
.flat_map(|&l| {
if let CCLoc::Stack(offset) = l {
if offset > 0 {
Some(offset as u32)
} else {
None
}
} else {
None
}
})
.max()
.unwrap_or(0);
let mut depth = self.block_state.depth.0 + total_stack_space;
if depth & 1 != 0 {
self.set_stack_depth(StackDepth(self.block_state.depth.0 + 1));
depth += 1;
}
let mut pending = Vec::<(ValueLocation, CCLoc)>::new();
for &loc in out_locs.iter().rev() {
let val = self.pop();
match loc {
CCLoc::Stack(offset) => {
let offset = self.adjusted_offset(offset as i32 - depth as i32);
if offset == -(WORD_SIZE as i32) {
self.push_physical(val);
self.free_value(val);
} else {
let gpr = self.into_reg(GPRType::Rq, val);
dynasm!(self.asm
; mov [rsp + offset], Rq(gpr.rq().unwrap())
);
self.block_state.regs.release(gpr);
}
}
CCLoc::Reg(r) => {
if val != ValueLocation::Reg(r) {
if self.block_state.regs.is_free(r) {
self.copy_value(val, loc);
self.block_state.regs.mark_used(r);
self.free_value(val);
} else {
pending.push((val, loc));
}
}
}
}
}
while !pending.is_empty() {
let start_len = pending.len();
for (src, dst) in mem::replace(&mut pending, vec![]) {
if let CCLoc::Reg(r) = dst {
if !self.block_state.regs.is_free(r) {
pending.push((src, dst));
continue;
}
self.block_state.regs.mark_used(r);
}
self.copy_value(src, dst);
self.free_value(src);
}
if pending.len() == start_len {
unimplemented!(
"We can't handle cycles in the register allocator: {:?}",
pending
);
}
}
self.set_stack_depth(StackDepth(depth));
}
fn push_function_returns(&mut self, returns: impl IntoIterator<Item = SignlessType>) {
for loc in ret_locs(returns) {
if let CCLoc::Reg(reg) = loc {
self.block_state.regs.mark_used(reg);
}
self.push(loc.into());
}
}
pub fn call_indirect(
&mut self,
type_id: u32,
arg_types: impl IntoIterator<Item = SignlessType>,
return_types: impl IntoIterator<Item = SignlessType>,
) {
let locs = arg_locs(arg_types);
for &loc in &locs {
if let CCLoc::Reg(r) = loc {
self.block_state.regs.mark_used(r);
}
}
let callee = self.pop();
let callee = self.into_temp_reg(I32, callee);
for &loc in &locs {
if let CCLoc::Reg(r) = loc {
self.block_state.regs.release(r);
}
}
self.save_volatile(locs.len()..);
self.block_state.depth.reserve(1);
dynasm!(self.asm
; push Rq(VMCTX)
);
let depth = self.block_state.depth.clone();
self.pass_outgoing_args(&locs);
let fail = self.trap_label().0;
let table_index = 0;
let reg_offset = self
.module_context
.defined_table_index(table_index)
.map(|index| {
(
None,
self.module_context.vmctx_vmtable_definition(index) as i32,
)
});
let vmctx = GPR::Rq(VMCTX);
let (reg, offset) = reg_offset.unwrap_or_else(|| {
let reg = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(reg.rq().unwrap()), [
Rq(VMCTX) + self.module_context.vmctx_vmtable_import_from(table_index) as i32
]
);
(Some(reg), 0)
});
let temp0 = self.take_reg(I64);
dynasm!(self.asm
; cmp Rd(callee.rq().unwrap()), [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) +
offset +
self.module_context.vmtable_definition_current_elements() as i32
]
; jae =>fail
; imul
Rd(callee.rq().unwrap()),
Rd(callee.rq().unwrap()),
self.module_context.size_of_vmcaller_checked_anyfunc() as i32
; mov Rq(temp0.rq().unwrap()), [
Rq(reg.unwrap_or(vmctx).rq().unwrap()) +
offset +
self.module_context.vmtable_definition_base() as i32
]
);
if let Some(reg) = reg {
self.block_state.regs.release(reg);
}
let temp1 = self.take_reg(I64);
dynasm!(self.asm
; mov Rd(temp1.rq().unwrap()), [
Rq(VMCTX) +
self.module_context
.vmctx_vmshared_signature_id(type_id) as i32
]
; cmp DWORD [
Rq(temp0.rq().unwrap()) +
Rq(callee.rq().unwrap()) +
self.module_context.vmcaller_checked_anyfunc_type_index() as i32
], Rd(temp1.rq().unwrap())
; jne =>fail
; mov Rq(VMCTX), [
Rq(temp0.rq().unwrap()) +
Rq(callee.rq().unwrap()) +
self.module_context.vmcaller_checked_anyfunc_vmctx() as i32
]
; call QWORD [
Rq(temp0.rq().unwrap()) +
Rq(callee.rq().unwrap()) +
self.module_context.vmcaller_checked_anyfunc_func_ptr() as i32
]
);
self.block_state.regs.release(temp0);
self.block_state.regs.release(temp1);
self.block_state.regs.release(callee);
for i in locs {
self.free_value(i.into());
}
self.push_function_returns(return_types);
self.set_stack_depth(depth);
dynasm!(self.asm
; pop Rq(VMCTX)
);
self.block_state.depth.free(1);
}
pub fn swap(&mut self, depth: u32) {
let last = self.block_state.stack.len() - 1;
self.block_state.stack.swap(last, last - depth as usize);
}
/// Call a function with the given index
pub fn call_direct(
&mut self,
index: u32,
arg_types: impl IntoIterator<Item = SignlessType>,
return_types: impl IntoIterator<Item = SignlessType>,
) {
self.relocated_function_call(
&ir::ExternalName::user(0, index),
arg_types,
return_types,
false,
);
}
/// Call a function with the given index
pub fn call_direct_self(
&mut self,
defined_index: u32,
arg_types: impl IntoIterator<Item = SignlessType>,
return_types: impl IntoIterator<Item = SignlessType>,
) {
let locs = arg_locs(arg_types);
self.save_volatile(locs.len()..);
let (_, label) = self.func_starts[defined_index as usize];
self.pass_outgoing_args(&locs);
dynasm!(self.asm
; call =>label
);
for i in locs {
self.free_value(i.into());
}
self.push_function_returns(return_types);
}
/// Call a function with the given index
pub fn call_direct_imported(
&mut self,
index: u32,
arg_types: impl IntoIterator<Item = SignlessType>,
return_types: impl IntoIterator<Item = SignlessType>,
) {
let locs = arg_locs(arg_types);
self.block_state.depth.reserve(1);
dynasm!(self.asm
; push Rq(VMCTX)
);
let depth = self.block_state.depth.clone();
self.save_volatile(locs.len()..);
self.pass_outgoing_args(&locs);
let callee = self.take_reg(I64);
dynasm!(self.asm
; mov Rq(callee.rq().unwrap()), [
Rq(VMCTX) + self.module_context.vmctx_vmfunction_import_body(index) as i32
]
; mov Rq(VMCTX), [
Rq(VMCTX) + self.module_context.vmctx_vmfunction_import_vmctx(index) as i32
]
; call Rq(callee.rq().unwrap())
);
self.block_state.regs.release(callee);
for i in locs {
self.free_value(i.into());
}
self.push_function_returns(return_types);
self.set_stack_depth(depth);
dynasm!(self.asm
; pop Rq(VMCTX)
);
self.block_state.depth.free(1);
}
// TODO: Reserve space to store RBX, RBP, and R12..R15 so we can use them
// as scratch registers
/// Writes the function prologue and stores the arguments as locals
pub fn start_function(&mut self, params: impl IntoIterator<Item = SignlessType>) {
let locs = Vec::from_iter(arg_locs(params));
self.apply_cc(&BlockCallingConvention::function_start(locs));
}
pub fn ret(&mut self) {
dynasm!(self.asm
; ret
);
}
/// Writes the function epilogue (right now all this does is add the trap label that the
/// conditional traps in `call_indirect` use)
pub fn epilogue(&mut self) {
let mut values = self.labels.values_mut().collect::<Vec<_>>();
values.sort_unstable_by_key(|(_, align, _)| *align);
for (label, align, func) in values {
if let Some(mut func) = func.take() {
dynasm!(self.asm
; .align *align as usize
);
self.asm.dynamic_label(label.0);
func(&mut self.asm);
}
}
}
pub fn trap(&mut self) {
let trap_label = self.trap_label();
dynasm!(self.asm
; jmp =>trap_label.0
);
}
pub fn trap_label(&mut self) -> Label {
self.label(|asm: &mut Assembler| {
dynasm!(asm
; ud2
);
})
}
pub fn ret_label(&mut self) -> Label {
self.label(|asm: &mut Assembler| {
dynasm!(asm
; ret
);
})
}
fn label<F>(&mut self, fun: F) -> Label
where
F: IntoLabel,
{
self.aligned_label(1, fun)
}
fn aligned_label<F>(&mut self, align: u32, fun: F) -> Label
where
F: IntoLabel,
{
let key = fun.key();
if let Some((label, _, _)) = self.labels.get(&(align, key)) {
return *label;
}
let label = self.create_label();
self.labels
.insert((align, key), (label, align, Some(fun.callback())));
label
}
fn target_to_label(&mut self, target: BrTarget<Label>) -> Label {
match target {
BrTarget::Label(label) => label,
BrTarget::Return => self.ret_label(),
}
}
}
trait IntoLabel {
fn key(&self) -> Either<TypeId, (LabelValue, Option<LabelValue>)>;
fn callback(self) -> Box<FnMut(&mut Assembler)>;
}
impl<F> IntoLabel for F
where
F: FnMut(&mut Assembler) + Any,
{
fn key(&self) -> Either<TypeId, (LabelValue, Option<LabelValue>)> {
Either::Left(TypeId::of::<Self>())
}
fn callback(self) -> Box<FnMut(&mut Assembler)> {
Box::new(self)
}
}
fn const_value(val: LabelValue) -> impl FnMut(&mut Assembler) {
move |asm| match val {
LabelValue::I32(val) => dynasm!(asm
; .dword val
),
LabelValue::I64(val) => dynasm!(asm
; .qword val
),
}
}
fn const_values(a: LabelValue, b: LabelValue) -> impl FnMut(&mut Assembler) {
move |asm| {
match a {
LabelValue::I32(val) => dynasm!(asm
; .dword val
),
LabelValue::I64(val) => dynasm!(asm
; .qword val
),
}
match b {
LabelValue::I32(val) => dynasm!(asm
; .dword val
),
LabelValue::I64(val) => dynasm!(asm
; .qword val
),
}
}
}
impl IntoLabel for LabelValue {
fn key(&self) -> Either<TypeId, (LabelValue, Option<LabelValue>)> {
Either::Right((*self, None))
}
fn callback(self) -> Box<FnMut(&mut Assembler)> {
Box::new(const_value(self))
}
}
impl IntoLabel for (LabelValue, LabelValue) {
fn key(&self) -> Either<TypeId, (LabelValue, Option<LabelValue>)> {
Either::Right((self.0, Some(self.1)))
}
fn callback(self) -> Box<FnMut(&mut Assembler)> {
Box::new(const_values(self.0, self.1))
}
}
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