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//! X64 structures.
#![allow(clippy::upper_case_acronyms)]
use crate::location::CombinedRegister;
use crate::location::Reg as AbstractReg;
use std::slice::Iter;
use wasmer_types::{CompileError, Type, target::CallingConvention};
/// General-purpose registers.
#[repr(u8)]
#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub enum GPR {
RAX = 0,
RCX = 1,
RDX = 2,
RBX = 3,
RSP = 4,
RBP = 5,
RSI = 6,
RDI = 7,
R8 = 8,
R9 = 9,
R10 = 10,
R11 = 11,
R12 = 12,
R13 = 13,
R14 = 14,
R15 = 15,
}
impl From<GPR> for u8 {
fn from(val: GPR) -> Self {
val as u8
}
}
/// XMM registers.
#[repr(u8)]
#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[allow(dead_code)]
pub enum XMM {
XMM0 = 0,
XMM1 = 1,
XMM2 = 2,
XMM3 = 3,
XMM4 = 4,
XMM5 = 5,
XMM6 = 6,
XMM7 = 7,
XMM8 = 8,
XMM9 = 9,
XMM10 = 10,
XMM11 = 11,
XMM12 = 12,
XMM13 = 13,
XMM14 = 14,
XMM15 = 15,
}
impl From<XMM> for u8 {
fn from(val: XMM) -> Self {
val as u8
}
}
impl AbstractReg for GPR {
fn into_index(self) -> usize {
self as usize
}
fn from_index(n: usize) -> Result<GPR, ()> {
match n {
0..=15 => Ok(*GPR::iterator().nth(n).unwrap()),
_ => Err(()),
}
}
fn iterator() -> Iter<'static, GPR> {
static GPRS: [GPR; 16] = [
GPR::RAX,
GPR::RCX,
GPR::RDX,
GPR::RBX,
GPR::RSP,
GPR::RBP,
GPR::RSI,
GPR::RDI,
GPR::R8,
GPR::R9,
GPR::R10,
GPR::R11,
GPR::R12,
GPR::R13,
GPR::R14,
GPR::R15,
];
GPRS.iter()
}
#[cfg(feature = "unwind")]
fn to_dwarf(self) -> gimli::Register {
use gimli::X86_64;
match self {
GPR::RAX => X86_64::RAX,
GPR::RCX => X86_64::RCX,
GPR::RDX => X86_64::RDX,
GPR::RBX => X86_64::RBX,
GPR::RSP => X86_64::RSP,
GPR::RBP => X86_64::RBP,
GPR::RSI => X86_64::RSI,
GPR::RDI => X86_64::RDI,
GPR::R8 => X86_64::R8,
GPR::R9 => X86_64::R9,
GPR::R10 => X86_64::R10,
GPR::R11 => X86_64::R11,
GPR::R12 => X86_64::R12,
GPR::R13 => X86_64::R13,
GPR::R14 => X86_64::R14,
GPR::R15 => X86_64::R15,
}
}
}
impl AbstractReg for XMM {
fn into_index(self) -> usize {
self as usize
}
fn from_index(n: usize) -> Result<XMM, ()> {
match n {
0..=15 => Ok(*XMM::iterator().nth(n).unwrap()),
_ => Err(()),
}
}
fn iterator() -> Iter<'static, XMM> {
static XMMS: [XMM; 16] = [
XMM::XMM0,
XMM::XMM1,
XMM::XMM2,
XMM::XMM3,
XMM::XMM4,
XMM::XMM5,
XMM::XMM6,
XMM::XMM7,
XMM::XMM8,
XMM::XMM9,
XMM::XMM10,
XMM::XMM11,
XMM::XMM12,
XMM::XMM13,
XMM::XMM14,
XMM::XMM15,
];
XMMS.iter()
}
#[cfg(feature = "unwind")]
fn to_dwarf(self) -> gimli::Register {
use gimli::X86_64;
match self {
XMM::XMM0 => X86_64::XMM0,
XMM::XMM1 => X86_64::XMM1,
XMM::XMM2 => X86_64::XMM2,
XMM::XMM3 => X86_64::XMM3,
XMM::XMM4 => X86_64::XMM4,
XMM::XMM5 => X86_64::XMM5,
XMM::XMM6 => X86_64::XMM6,
XMM::XMM7 => X86_64::XMM7,
XMM::XMM8 => X86_64::XMM8,
XMM::XMM9 => X86_64::XMM9,
XMM::XMM10 => X86_64::XMM10,
XMM::XMM11 => X86_64::XMM11,
XMM::XMM12 => X86_64::XMM12,
XMM::XMM13 => X86_64::XMM13,
XMM::XMM14 => X86_64::XMM14,
XMM::XMM15 => X86_64::XMM15,
}
}
}
/// A machine register under the x86-64 architecture.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum X64Register {
/// General-purpose registers.
GPR(GPR),
/// XMM (floating point/SIMD) registers.
XMM(XMM),
}
impl CombinedRegister for X64Register {
/// Convert from a GPR register
fn from_gpr(x: u16) -> Self {
X64Register::GPR(GPR::from_index(x as usize).unwrap())
}
/// Convert from an SIMD register
fn from_simd(x: u16) -> Self {
X64Register::XMM(XMM::from_index(x as usize).unwrap())
}
/* x86_64-abi-0.99.pdf
* Register Name | Number | Abbreviation
* General Purpose Register RAX | 0 | %rax
* General Purpose Register RDX | 1 | %rdx
* General Purpose Register RCX | 2 | %rcx
* General Purpose Register RBX | 3 | %rbx
* General Purpose Register RSI | 4 | %rsi
* General Purpose Register RDI | 5 | %rdi
* Frame Pointer Register RBP | 6 | %rbp
* Stack Pointer Register RSP | 7 | %rsp
* Extended Integer Registers 8-15 | 8-15 | %r8-%r15
* Return Address RA | 16 |
* Vector Registers 0-7 | 17-24 | %xmm0-%xmm7
* Extended Vector Registers 8-15 | 25-32 | %xmm8-%xmm15
* Floating Point Registers 0-7 | 33-40 | %st0-%st7
* MMX Registers 0-7 | 41-48 | %mm0-%mm7
* Flag Register | 49 | %rFLAGS
* Segment Register ES | 50 | %es
* Segment Register CS | 51 | %cs
* Segment Register SS | 52 | %ss
* Segment Register DS | 53 | %ds
* Segment Register FS | 54 | %fs
* Segment Register GS | 55 | %gs
* Reserved | 56-57 |
* FS Base address | 58 | %fs.base
* GS Base address | 59 | %gs.base
* Reserved | 60-61 |
* Task Register | 62 | %tr
* LDT Register | 63 | %ldtr
* 128-bit Media Control and Status | 64 | %mxcsr
* x87 Control Word | 65 | %fcw
* x87 Status Word | 66 | %fsw
*/
}
/// An allocator that allocates registers for function arguments according to the System V ABI.
#[derive(Default)]
pub struct ArgumentRegisterAllocator {
n_gprs: usize,
n_xmms: usize,
}
impl ArgumentRegisterAllocator {
/// Allocates a register for argument type `ty`. Returns `None` if no register is available for this type.
pub fn next(
&mut self,
ty: Type,
calling_convention: CallingConvention,
) -> Result<Option<X64Register>, CompileError> {
let ret = match calling_convention {
CallingConvention::WindowsFastcall => {
static GPR_SEQ: &[GPR] = &[GPR::RCX, GPR::RDX, GPR::R8, GPR::R9];
static XMM_SEQ: &[XMM] = &[XMM::XMM0, XMM::XMM1, XMM::XMM2, XMM::XMM3];
let idx = self.n_gprs + self.n_xmms;
match ty {
Type::I32 | Type::I64 => {
if idx < 4 {
let gpr = GPR_SEQ[idx];
self.n_gprs += 1;
Some(X64Register::GPR(gpr))
} else {
None
}
}
Type::F32 | Type::F64 => {
if idx < 4 {
let xmm = XMM_SEQ[idx];
self.n_xmms += 1;
Some(X64Register::XMM(xmm))
} else {
None
}
}
_ => {
return Err(CompileError::Codegen(format!(
"No register available for {calling_convention:?} and type {ty}"
)));
}
}
}
_ => {
static GPR_SEQ: &[GPR] =
&[GPR::RDI, GPR::RSI, GPR::RDX, GPR::RCX, GPR::R8, GPR::R9];
static XMM_SEQ: &[XMM] = &[
XMM::XMM0,
XMM::XMM1,
XMM::XMM2,
XMM::XMM3,
XMM::XMM4,
XMM::XMM5,
XMM::XMM6,
XMM::XMM7,
];
match ty {
Type::I32 | Type::I64 => {
if self.n_gprs < GPR_SEQ.len() {
let gpr = GPR_SEQ[self.n_gprs];
self.n_gprs += 1;
Some(X64Register::GPR(gpr))
} else {
None
}
}
Type::F32 | Type::F64 => {
if self.n_xmms < XMM_SEQ.len() {
let xmm = XMM_SEQ[self.n_xmms];
self.n_xmms += 1;
Some(X64Register::XMM(xmm))
} else {
None
}
}
_ => {
return Err(CompileError::Codegen(format!(
"No register available for {calling_convention:?} and type {ty}"
)));
}
}
}
};
Ok(ret)
}
}