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|
module native
import v.ast
enum Arm64Register {
x0
x1
x2
x3
x4
x5
x6
x7
x8
x9
x10
x11
x12
x13
x14
x15
x16
}
pub struct Arm64 {
mut:
g Gen
// arm64 specific stuff for code generation
}
pub fn (mut x Arm64) allocate_var(name string, size int, initial_val int) {
eprintln('TODO: allocating var on arm64 ($name) = $size = $initial_val')
}
fn (mut g Gen) mov_arm(reg Arm64Register, val u64) {
// m := u64(0xffff)
// x := u64(val)
// println('========')
// println(x & ~m)
// println(x & ~(m << 16))
// g.write32(0x777777)
r := int(reg)
if r == 0 && val == 1 {
g.write32(0xd2800020)
g.println('mov x0, 1')
} else if r >= 0 && r <= 16 {
g.write32(0xd2800000 + int(r) + (int(val) << 5))
g.println('mov x$r, $val')
} else {
verror('mov_arm unsupported values')
}
/*
if 1 ^ (x & ~m) != 0 {
// println('yep')
g.write32(int(u64(0x52800000) | u64(r) | x << 5))
g.write32(0x88888888)
g.write32(int(u64(0x52800000) | u64(r) | x >> 11))
} else if 1 ^ (x & ~(m << 16)) != 0 {
// g.write32(int(u64(0x52800000) | u64(r) | x >> 11))
// println('yep2')
// g.write32(0x52a00000 | r | val >> 11)
}
*/
}
pub fn (mut g Gen) fn_decl_arm64(node ast.FnDecl) {
g.gen_arm64_helloworld()
// TODO
}
pub fn (mut g Gen) call_fn_arm64(node ast.CallExpr) {
name := node.name
// println('call fn $name')
addr := g.fn_addr[name]
if addr == 0 {
verror('fn addr of `$name` = 0')
}
// Copy values to registers (calling convention)
// g.mov_arm(.eax, 0)
for i in 0 .. node.args.len {
expr := node.args[i].expr
match expr {
ast.IntegerLiteral {
// `foo(2)` => `mov edi,0x2`
// g.mov_arm(native.fn_arg_registers[i], expr.val.int())
}
/*
ast.Ident {
// `foo(x)` => `mov edi,DWORD PTR [rbp-0x8]`
var_offset := g.get_var_offset(expr.name)
if g.pref.is_verbose {
println('i=$i fn name= $name offset=$var_offset')
println(int(native.fn_arg_registers[i]))
}
g.mov_var_to_reg(native.fn_arg_registers[i], var_offset)
}
*/
else {
verror('unhandled call_fn (name=$name) node: ' + expr.type_name())
}
}
}
if node.args.len > 6 {
verror('more than 6 args not allowed for now')
}
g.call(int(addr))
g.println('fn call `${name}()`')
// println('call $name $addr')
}
fn (mut g Gen) gen_arm64_helloworld() {
if g.pref.os == .linux {
g.mov_arm(.x0, 1)
g.adr(.x1, 0x10)
g.mov_arm(.x2, 13)
g.mov_arm(.x8, 64) // write (linux-arm64)
g.svc()
} else {
g.mov_arm(.x0, 0)
g.mov_arm(.x16, 1)
g.svc()
}
zero := ast.IntegerLiteral{}
g.gen_exit(zero)
g.write_string('Hello World!\n')
g.write8(0) // padding?
g.write8(0)
g.write8(0)
}
fn (mut g Gen) adr(r Arm64Register, delta int) {
g.write32(0x10000000 | int(r) | (delta << 4))
g.println('adr $r, $delta')
}
fn (mut g Gen) bl() {
// g.write32(0xa9400000)
g.write32(0x94000000)
g.println('bl 0')
}
fn (mut g Gen) svc() {
g.write32(0xd4001001)
g.println('svc 0x80')
}
pub fn (mut c Arm64) gen_exit(mut g Gen, expr ast.Expr) {
mut return_code := u64(0)
match expr {
ast.IntegerLiteral {
return_code = expr.val.u64()
}
else {
verror('native builtin exit expects a numeric argument')
}
}
match c.g.pref.os {
.macos {
c.g.mov_arm(.x0, return_code)
c.g.mov_arm(.x16, 1) // syscall exit
}
.linux {
c.g.mov_arm(.x16, return_code)
c.g.mov_arm(.x8, 93)
c.g.mov_arm(.x0, 0)
}
else {
verror('unsupported os $c.g.pref.os')
}
}
g.svc()
}
pub fn (mut g Gen) gen_arm64_exit(expr ast.Expr) {
match expr {
ast.IntegerLiteral {
g.mov_arm(.x16, expr.val.u64())
}
else {
verror('native builtin exit expects a numeric argument')
}
}
g.mov_arm(.x0, 0)
g.svc()
}
|
