1 use gccjit::{ToRValue, Type};
2 use rustc_codegen_ssa::traits::{AbiBuilderMethods, BaseTypeMethods};
3 use rustc_middle::bug;
4 use rustc_middle::ty::Ty;
5 use rustc_target::abi::call::{CastTarget, FnAbi, PassMode, Reg, RegKind};
6 
7 use crate::builder::Builder;
8 use crate::context::CodegenCx;
9 use crate::intrinsic::ArgAbiExt;
10 use crate::type_of::LayoutGccExt;
11 
12 impl<'a, 'gcc, 'tcx> AbiBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
apply_attrs_callsite(&mut self, _fn_abi: &FnAbi<'tcx, Ty<'tcx>>, _callsite: Self::Value)13     fn apply_attrs_callsite(&mut self, _fn_abi: &FnAbi<'tcx, Ty<'tcx>>, _callsite: Self::Value) {
14         // TODO(antoyo)
15     }
16 
get_param(&mut self, index: usize) -> Self::Value17     fn get_param(&mut self, index: usize) -> Self::Value {
18         self.cx.current_func.borrow().expect("current func")
19             .get_param(index as i32)
20             .to_rvalue()
21     }
22 }
23 
24 impl GccType for CastTarget {
gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc>25     fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc> {
26         let rest_gcc_unit = self.rest.unit.gcc_type(cx);
27         let (rest_count, rem_bytes) =
28             if self.rest.unit.size.bytes() == 0 {
29                 (0, 0)
30             }
31             else {
32                 (self.rest.total.bytes() / self.rest.unit.size.bytes(), self.rest.total.bytes() % self.rest.unit.size.bytes())
33             };
34 
35         if self.prefix.iter().all(|x| x.is_none()) {
36             // Simplify to a single unit when there is no prefix and size <= unit size
37             if self.rest.total <= self.rest.unit.size {
38                 return rest_gcc_unit;
39             }
40 
41             // Simplify to array when all chunks are the same size and type
42             if rem_bytes == 0 {
43                 return cx.type_array(rest_gcc_unit, rest_count);
44             }
45         }
46 
47         // Create list of fields in the main structure
48         let mut args: Vec<_> = self
49             .prefix
50             .iter()
51             .flat_map(|option_kind| {
52                 option_kind.map(|kind| Reg { kind, size: self.prefix_chunk_size }.gcc_type(cx))
53             })
54             .chain((0..rest_count).map(|_| rest_gcc_unit))
55             .collect();
56 
57         // Append final integer
58         if rem_bytes != 0 {
59             // Only integers can be really split further.
60             assert_eq!(self.rest.unit.kind, RegKind::Integer);
61             args.push(cx.type_ix(rem_bytes * 8));
62         }
63 
64         cx.type_struct(&args, false)
65     }
66 }
67 
68 pub trait GccType {
gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc>69     fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc>;
70 }
71 
72 impl GccType for Reg {
gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc>73     fn gcc_type<'gcc>(&self, cx: &CodegenCx<'gcc, '_>) -> Type<'gcc> {
74         match self.kind {
75             RegKind::Integer => cx.type_ix(self.size.bits()),
76             RegKind::Float => {
77                 match self.size.bits() {
78                     32 => cx.type_f32(),
79                     64 => cx.type_f64(),
80                     _ => bug!("unsupported float: {:?}", self),
81                 }
82             },
83             RegKind::Vector => unimplemented!(), //cx.type_vector(cx.type_i8(), self.size.bytes()),
84         }
85     }
86 }
87 
88 pub trait FnAbiGccExt<'gcc, 'tcx> {
89     // TODO(antoyo): return a function pointer type instead?
gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> (Type<'gcc>, Vec<Type<'gcc>>, bool)90     fn gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> (Type<'gcc>, Vec<Type<'gcc>>, bool);
ptr_to_gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>91     fn ptr_to_gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>;
92 }
93 
94 impl<'gcc, 'tcx> FnAbiGccExt<'gcc, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> (Type<'gcc>, Vec<Type<'gcc>>, bool)95     fn gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> (Type<'gcc>, Vec<Type<'gcc>>, bool) {
96         let args_capacity: usize = self.args.iter().map(|arg|
97             if arg.pad.is_some() {
98                 1
99             }
100             else {
101                 0
102             } +
103             if let PassMode::Pair(_, _) = arg.mode {
104                 2
105             } else {
106                 1
107             }
108         ).sum();
109         let mut argument_tys = Vec::with_capacity(
110             if let PassMode::Indirect { .. } = self.ret.mode {
111                 1
112             }
113             else {
114                 0
115             } + args_capacity,
116         );
117 
118         let return_ty =
119             match self.ret.mode {
120                 PassMode::Ignore => cx.type_void(),
121                 PassMode::Direct(_) | PassMode::Pair(..) => self.ret.layout.immediate_gcc_type(cx),
122                 PassMode::Cast(cast) => cast.gcc_type(cx),
123                 PassMode::Indirect { .. } => {
124                     argument_tys.push(cx.type_ptr_to(self.ret.memory_ty(cx)));
125                     cx.type_void()
126                 }
127             };
128 
129         for arg in &self.args {
130             // add padding
131             if let Some(ty) = arg.pad {
132                 argument_tys.push(ty.gcc_type(cx));
133             }
134 
135             let arg_ty = match arg.mode {
136                 PassMode::Ignore => continue,
137                 PassMode::Direct(_) => arg.layout.immediate_gcc_type(cx),
138                 PassMode::Pair(..) => {
139                     argument_tys.push(arg.layout.scalar_pair_element_gcc_type(cx, 0, true));
140                     argument_tys.push(arg.layout.scalar_pair_element_gcc_type(cx, 1, true));
141                     continue;
142                 }
143                 PassMode::Indirect { extra_attrs: Some(_), .. } => {
144                     unimplemented!();
145                 }
146                 PassMode::Cast(cast) => cast.gcc_type(cx),
147                 PassMode::Indirect { extra_attrs: None, .. } => cx.type_ptr_to(arg.memory_ty(cx)),
148             };
149             argument_tys.push(arg_ty);
150         }
151 
152         (return_ty, argument_tys, self.c_variadic)
153     }
154 
ptr_to_gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc>155     fn ptr_to_gcc_type(&self, cx: &CodegenCx<'gcc, 'tcx>) -> Type<'gcc> {
156         let (return_type, params, variadic) = self.gcc_type(cx);
157         let pointer_type = cx.context.new_function_pointer_type(None, return_type, &params, variadic);
158         pointer_type
159     }
160 }
161