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use gccjit::{ToLValue, ToRValue, Type};
use rustc_codegen_ssa::traits::{AbiBuilderMethods, BaseTypeMethods};
use rustc_data_structures::fx::FxHashSet;
use rustc_middle::bug;
use rustc_middle::ty::Ty;
use rustc_target::abi::call::{CastTarget, FnAbi, PassMode, Reg, RegKind};
use crate::builder::Builder;
use crate::context::CodegenCx;
use crate::intrinsic::ArgAbiExt;
use crate::type_of::LayoutGccExt;
impl<'a, 'gcc, 'tcx> AbiBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
fn get_param(&mut self, index: usize) -> Self::Value {
let func = self.current_func();
let param = func.get_param(index as i32);
let on_stack =
if let Some(on_stack_param_indices) = self.on_stack_function_params.borrow().get(&func) {
on_stack_param_indices.contains(&index)
}
else {
false
};
if on_stack {
param.to_lvalue().get_address(None)
}
else {
param.to_rvalue()
}
}
}
impl GccType for CastTarget {
fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc> {
let rest_gcc_unit = self.rest.unit.gcc_type(cx);
let (rest_count, rem_bytes) =
if self.rest.unit.size.bytes() == 0 {
(0, 0)
}
else {
(self.rest.total.bytes() / self.rest.unit.size.bytes(), self.rest.total.bytes() % self.rest.unit.size.bytes())
};
if self.prefix.iter().all(|x| x.is_none()) {
// Simplify to a single unit when there is no prefix and size <= unit size
if self.rest.total <= self.rest.unit.size {
return rest_gcc_unit;
}
// Simplify to array when all chunks are the same size and type
if rem_bytes == 0 {
return cx.type_array(rest_gcc_unit, rest_count);
}
}
// Create list of fields in the main structure
let mut args: Vec<_> = self
.prefix
.iter()
.flat_map(|option_reg| {
option_reg.map(|reg| reg.gcc_type(cx))
})
.chain((0..rest_count).map(|_| rest_gcc_unit))
.collect();
// Append final integer
if rem_bytes != 0 {
// Only integers can be really split further.
assert_eq!(self.rest.unit.kind, RegKind::Integer);
args.push(cx.type_ix(rem_bytes * 8));
}
cx.type_struct(&args, false)
}
}
pub trait GccType {
fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc>;
}
impl GccType for Reg {
fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc> {
match self.kind {
RegKind::Integer => cx.type_ix(self.size.bits()),
RegKind::Float => {
match self.size.bits() {
32 => cx.type_f32(),
64 => cx.type_f64(),
_ => bug!("unsupported float: {:?}", self),
}
},
RegKind::Vector => unimplemented!(), //cx.type_vector(cx.type_i8(), self.size.bytes()),
}
}
}
pub trait FnAbiGccExt<'gcc, 'tcx> {
// TODO(antoyo): return a function pointer type instead?
fn gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> (Type<'gcc>, Vec<Type<'gcc>>, bool, FxHashSet<usize>);
fn ptr_to_gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
}
impl<'gcc, 'tcx> FnAbiGccExt<'gcc, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
fn gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> (Type<'gcc>, Vec<Type<'gcc>>, bool, FxHashSet<usize>) {
let mut on_stack_param_indices = FxHashSet::default();
// This capacity calculation is approximate.
let mut argument_tys = Vec::with_capacity(
self.args.len() + if let PassMode::Indirect { .. } = self.ret.mode { 1 } else { 0 }
);
let return_ty =
match self.ret.mode {
PassMode::Ignore => cx.type_void(),
PassMode::Direct(_) | PassMode::Pair(..) => self.ret.layout.immediate_gcc_type(cx),
PassMode::Cast(ref cast, _) => cast.gcc_type(cx),
PassMode::Indirect { .. } => {
argument_tys.push(cx.type_ptr_to(self.ret.memory_ty(cx)));
cx.type_void()
}
};
for arg in self.args.iter() {
let arg_ty = match arg.mode {
PassMode::Ignore => continue,
PassMode::Direct(_) => arg.layout.immediate_gcc_type(cx),
PassMode::Pair(..) => {
argument_tys.push(arg.layout.scalar_pair_element_gcc_type(cx, 0, true));
argument_tys.push(arg.layout.scalar_pair_element_gcc_type(cx, 1, true));
continue;
}
PassMode::Indirect { extra_attrs: Some(_), .. } => {
unimplemented!();
}
PassMode::Cast(ref cast, pad_i32) => {
// add padding
if pad_i32 {
argument_tys.push(Reg::i32().gcc_type(cx));
}
cast.gcc_type(cx)
}
PassMode::Indirect { extra_attrs: None, on_stack: true, .. } => {
on_stack_param_indices.insert(argument_tys.len());
arg.memory_ty(cx)
},
PassMode::Indirect { extra_attrs: None, on_stack: false, .. } => cx.type_ptr_to(arg.memory_ty(cx)),
};
argument_tys.push(arg_ty);
}
(return_ty, argument_tys, self.c_variadic, on_stack_param_indices)
}
fn ptr_to_gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
let (return_type, params, variadic, on_stack_param_indices) = self.gcc_type(cx);
let pointer_type = cx.context.new_function_pointer_type(None, return_type, ¶ms, variadic);
cx.on_stack_params.borrow_mut().insert(pointer_type.dyncast_function_ptr_type().expect("function ptr type"), on_stack_param_indices);
pointer_type
}
}
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