1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
// Copyright (C) 2025 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "rust-derive-debug.h"
#include "rust-ast.h"
#include "rust-hir-map.h"
#include "rust-system.h"
namespace Rust {
namespace AST {
DeriveDebug::DeriveDebug (location_t loc)
: DeriveVisitor (loc), expanded (nullptr)
{}
std::unique_ptr<Item>
DeriveDebug::go (Item &item)
{
item.accept_vis (*this);
rust_assert (expanded);
return std::move (expanded);
}
/* Pointer-ify something */
template <typename T>
static std::unique_ptr<T>
ptrify (T value)
{
return std::unique_ptr<T> (new T (value));
}
std::unique_ptr<AssociatedItem>
DeriveDebug::stub_debug_fn ()
{
auto unit_expr = builder.tuple ();
auto ok_expr
= ptrify (builder.path_in_expression (LangItem::Kind::RESULT_OK));
auto stub_return = builder.call (std::move (ok_expr), std::move (unit_expr));
// we can't use builder.block() here as it returns a unique_ptr<Expr> and
// Function's constructor expects a unique_ptr<BlockExpr>
auto block = std::unique_ptr<BlockExpr> (
new BlockExpr ({}, std::move (stub_return), {}, {},
AST::LoopLabel::error (), loc, loc));
auto self = builder.self_ref_param ();
auto return_type
= ptrify (builder.type_path ({"core", "fmt", "Result"}, true));
auto mut_fmt_type_inner
= ptrify (builder.type_path ({"core", "fmt", "Formatter"}, true));
auto mut_fmt_type
= builder.reference_type (std::move (mut_fmt_type_inner), true);
auto fmt = builder.function_param (builder.identifier_pattern ("_fmt"),
std::move (mut_fmt_type));
auto params = vec (std::move (self), std::move (fmt));
auto function = builder.function ("fmt", std::move (params),
std::move (return_type), std::move (block));
return function;
}
std::unique_ptr<Item>
DeriveDebug::stub_derive_impl (
std::string name,
const std::vector<std::unique_ptr<GenericParam>> &type_generics)
{
auto trait_items = vec (stub_debug_fn ());
auto debug = builder.type_path ({"core", "fmt", "Debug"}, true);
auto generics
= setup_impl_generics (name, type_generics, builder.trait_bound (debug));
return builder.trait_impl (debug, std::move (generics.self_type),
std::move (trait_items),
std::move (generics.impl));
}
void
DeriveDebug::visit_struct (StructStruct &struct_item)
{
expanded = stub_derive_impl (struct_item.get_identifier ().as_string (),
struct_item.get_generic_params ());
}
void
DeriveDebug::visit_tuple (TupleStruct &tuple_item)
{
expanded = stub_derive_impl (tuple_item.get_identifier ().as_string (),
tuple_item.get_generic_params ());
}
void
DeriveDebug::visit_enum (Enum &enum_item)
{
expanded = stub_derive_impl (enum_item.get_identifier ().as_string (),
enum_item.get_generic_params ());
}
void
DeriveDebug::visit_union (Union &enum_item)
{
rust_error_at (loc, "derive(Debug) cannot be derived for unions");
}
} // namespace AST
} // namespace Rust
|
