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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// Copyright (C) 2020-2022 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-compile-pattern.h"
#include "rust-compile-expr.h"
#include "rust-constexpr.h"
namespace Rust {
namespace Compile {
void
CompilePatternCaseLabelExpr::visit (HIR::PathInExpression &pattern)
{
// lookup the type
TyTy::BaseType *lookup = nullptr;
bool ok
= ctx->get_tyctx ()->lookup_type (pattern.get_mappings ().get_hirid (),
&lookup);
rust_assert (ok);
// this must be an enum
rust_assert (lookup->get_kind () == TyTy::TypeKind::ADT);
TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (lookup);
rust_assert (adt->is_enum ());
// lookup the variant
HirId variant_id;
ok = ctx->get_tyctx ()->lookup_variant_definition (
pattern.get_mappings ().get_hirid (), &variant_id);
rust_assert (ok);
TyTy::VariantDef *variant = nullptr;
ok = adt->lookup_variant_by_id (variant_id, &variant);
rust_assert (ok);
HIR::Expr *discrim_expr = variant->get_discriminant ();
tree discrim_expr_node = CompileExpr::Compile (discrim_expr, ctx);
tree folded_discrim_expr = ConstCtx::fold (discrim_expr_node);
tree case_low = folded_discrim_expr;
case_label_expr
= build_case_label (case_low, NULL_TREE, associated_case_label);
}
void
CompilePatternCaseLabelExpr::visit (HIR::StructPattern &pattern)
{
CompilePatternCaseLabelExpr::visit (pattern.get_path ());
}
void
CompilePatternCaseLabelExpr::visit (HIR::TupleStructPattern &pattern)
{
CompilePatternCaseLabelExpr::visit (pattern.get_path ());
}
void
CompilePatternCaseLabelExpr::visit (HIR::WildcardPattern &pattern)
{
// operand 0 being NULL_TREE signifies this is the default case label see:
// tree.def for documentation for CASE_LABEL_EXPR
case_label_expr
= build_case_label (NULL_TREE, NULL_TREE, associated_case_label);
}
// setup the bindings
void
CompilePatternBindings::visit (HIR::TupleStructPattern &pattern)
{
// lookup the type
TyTy::BaseType *lookup = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (
pattern.get_path ().get_mappings ().get_hirid (), &lookup);
rust_assert (ok);
// this must be an enum
rust_assert (lookup->get_kind () == TyTy::TypeKind::ADT);
TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (lookup);
rust_assert (adt->is_enum ());
// lookup the variant
HirId variant_id;
ok = ctx->get_tyctx ()->lookup_variant_definition (
pattern.get_path ().get_mappings ().get_hirid (), &variant_id);
rust_assert (ok);
int variant_index = -1;
TyTy::VariantDef *variant = nullptr;
ok = adt->lookup_variant_by_id (variant_id, &variant, &variant_index);
rust_assert (ok);
rust_assert (variant->get_variant_type ()
== TyTy::VariantDef::VariantType::TUPLE);
std::unique_ptr<HIR::TupleStructItems> &items = pattern.get_items ();
switch (items->get_item_type ())
{
case HIR::TupleStructItems::RANGE: {
// TODO
gcc_unreachable ();
}
break;
case HIR::TupleStructItems::NO_RANGE: {
HIR::TupleStructItemsNoRange &items_no_range
= static_cast<HIR::TupleStructItemsNoRange &> (*items.get ());
rust_assert (items_no_range.get_patterns ().size ()
== variant->num_fields ());
// we are offsetting by + 1 here since the first field in the record
// is always the discriminator
size_t tuple_field_index = 1;
for (auto &pattern : items_no_range.get_patterns ())
{
tree variant_accessor
= ctx->get_backend ()->struct_field_expression (
match_scrutinee_expr, variant_index, pattern->get_locus ());
tree binding = ctx->get_backend ()->struct_field_expression (
variant_accessor, tuple_field_index++, pattern->get_locus ());
ctx->insert_pattern_binding (
pattern->get_pattern_mappings ().get_hirid (), binding);
}
}
break;
}
}
void
CompilePatternBindings::visit (HIR::StructPattern &pattern)
{
// lookup the type
TyTy::BaseType *lookup = nullptr;
bool ok = ctx->get_tyctx ()->lookup_type (
pattern.get_path ().get_mappings ().get_hirid (), &lookup);
rust_assert (ok);
// this must be an enum
rust_assert (lookup->get_kind () == TyTy::TypeKind::ADT);
TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (lookup);
rust_assert (adt->is_enum ());
// lookup the variant
HirId variant_id;
ok = ctx->get_tyctx ()->lookup_variant_definition (
pattern.get_path ().get_mappings ().get_hirid (), &variant_id);
rust_assert (ok);
int variant_index = -1;
TyTy::VariantDef *variant = nullptr;
ok = adt->lookup_variant_by_id (variant_id, &variant, &variant_index);
rust_assert (ok);
rust_assert (variant->get_variant_type ()
== TyTy::VariantDef::VariantType::STRUCT);
auto &struct_pattern_elems = pattern.get_struct_pattern_elems ();
for (auto &field : struct_pattern_elems.get_struct_pattern_fields ())
{
switch (field->get_item_type ())
{
case HIR::StructPatternField::ItemType::TUPLE_PAT: {
// TODO
gcc_unreachable ();
}
break;
case HIR::StructPatternField::ItemType::IDENT_PAT: {
// TODO
gcc_unreachable ();
}
break;
case HIR::StructPatternField::ItemType::IDENT: {
HIR::StructPatternFieldIdent &ident
= static_cast<HIR::StructPatternFieldIdent &> (*field.get ());
tree variant_accessor
= ctx->get_backend ()->struct_field_expression (
match_scrutinee_expr, variant_index, ident.get_locus ());
size_t offs = 0;
ok
= variant->lookup_field (ident.get_identifier (), nullptr, &offs);
rust_assert (ok);
// we are offsetting by + 1 here since the first field in the record
// is always the discriminator
tree binding = ctx->get_backend ()->struct_field_expression (
variant_accessor, offs + 1, ident.get_locus ());
ctx->insert_pattern_binding (ident.get_mappings ().get_hirid (),
binding);
}
break;
}
}
}
} // namespace Compile
} // namespace Rust
|
