1 use gccjit::{FunctionType, ToRValue};
2 use rustc_ast::expand::allocator::{AllocatorKind, AllocatorTy, ALLOCATOR_METHODS};
3 use rustc_middle::bug;
4 use rustc_middle::ty::TyCtxt;
5 use rustc_span::symbol::sym;
6
7 use crate::GccContext;
8
codegen(tcx: TyCtxt<'_>, mods: &mut GccContext, _module_name: &str, kind: AllocatorKind, has_alloc_error_handler: bool)9 pub(crate) unsafe fn codegen(tcx: TyCtxt<'_>, mods: &mut GccContext, _module_name: &str, kind: AllocatorKind, has_alloc_error_handler: bool) {
10 let context = &mods.context;
11 let usize =
12 match tcx.sess.target.pointer_width {
13 16 => context.new_type::<u16>(),
14 32 => context.new_type::<u32>(),
15 64 => context.new_type::<u64>(),
16 tws => bug!("Unsupported target word size for int: {}", tws),
17 };
18 let i8 = context.new_type::<i8>();
19 let i8p = i8.make_pointer();
20 let void = context.new_type::<()>();
21
22 for method in ALLOCATOR_METHODS {
23 let mut types = Vec::with_capacity(method.inputs.len());
24 for ty in method.inputs.iter() {
25 match *ty {
26 AllocatorTy::Layout => {
27 types.push(usize);
28 types.push(usize);
29 }
30 AllocatorTy::Ptr => types.push(i8p),
31 AllocatorTy::Usize => types.push(usize),
32
33 AllocatorTy::ResultPtr | AllocatorTy::Unit => panic!("invalid allocator arg"),
34 }
35 }
36 let output = match method.output {
37 AllocatorTy::ResultPtr => Some(i8p),
38 AllocatorTy::Unit => None,
39
40 AllocatorTy::Layout | AllocatorTy::Usize | AllocatorTy::Ptr => {
41 panic!("invalid allocator output")
42 }
43 };
44 let name = format!("__rust_{}", method.name);
45
46 let args: Vec<_> = types.iter().enumerate()
47 .map(|(index, typ)| context.new_parameter(None, *typ, &format!("param{}", index)))
48 .collect();
49 let func = context.new_function(None, FunctionType::Exported, output.unwrap_or(void), &args, name, false);
50
51 if tcx.sess.target.options.default_hidden_visibility {
52 // TODO(antoyo): set visibility.
53 }
54 if tcx.sess.must_emit_unwind_tables() {
55 // TODO(antoyo): emit unwind tables.
56 }
57
58 let callee = kind.fn_name(method.name);
59 let args: Vec<_> = types.iter().enumerate()
60 .map(|(index, typ)| context.new_parameter(None, *typ, &format!("param{}", index)))
61 .collect();
62 let callee = context.new_function(None, FunctionType::Extern, output.unwrap_or(void), &args, callee, false);
63 // TODO(antoyo): set visibility.
64
65 let block = func.new_block("entry");
66
67 let args = args
68 .iter()
69 .enumerate()
70 .map(|(i, _)| func.get_param(i as i32).to_rvalue())
71 .collect::<Vec<_>>();
72 let ret = context.new_call(None, callee, &args);
73 //llvm::LLVMSetTailCall(ret, True);
74 if output.is_some() {
75 block.end_with_return(None, ret);
76 }
77 else {
78 block.end_with_void_return(None);
79 }
80
81 // TODO(@Commeownist): Check if we need to emit some extra debugging info in certain circumstances
82 // as described in https://github.com/rust-lang/rust/commit/77a96ed5646f7c3ee8897693decc4626fe380643
83 }
84
85 let types = [usize, usize];
86 let name = "__rust_alloc_error_handler".to_string();
87 let args: Vec<_> = types.iter().enumerate()
88 .map(|(index, typ)| context.new_parameter(None, *typ, &format!("param{}", index)))
89 .collect();
90 let func = context.new_function(None, FunctionType::Exported, void, &args, name, false);
91
92 let kind =
93 if has_alloc_error_handler {
94 AllocatorKind::Global
95 }
96 else {
97 AllocatorKind::Default
98 };
99 let callee = kind.fn_name(sym::oom);
100 let args: Vec<_> = types.iter().enumerate()
101 .map(|(index, typ)| context.new_parameter(None, *typ, &format!("param{}", index)))
102 .collect();
103 let callee = context.new_function(None, FunctionType::Extern, void, &args, callee, false);
104 //llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
105
106 let block = func.new_block("entry");
107
108 let args = args
109 .iter()
110 .enumerate()
111 .map(|(i, _)| func.get_param(i as i32).to_rvalue())
112 .collect::<Vec<_>>();
113 let _ret = context.new_call(None, callee, &args);
114 //llvm::LLVMSetTailCall(ret, True);
115 block.end_with_void_return(None);
116 }
117