From: Robert Goss <goss.rob...@gmail.com>
Fixes #2381
If a struct type is initialized with one of it's fields repeated it will
currently issue an error at the use site. However we would like to give the
rust error code and (like rustc) show both the specifications for the field to
help the user diagnose the issue.
We move the check after the index for the field has been established so we can
look up if the field has already been defined and get it's location.
We update the visit method to return if it has handled an error otherwise we
then output a second fatal error as not all the field in the specification have
been processed.
gcc/rust/ChangeLog:
* typecheck/rust-hir-type-check-struct-field.h: Allow visit to return a
bool
* typecheck/rust-hir-type-check-struct.cc: Improve check of repeat
fields
gcc/testsuite/ChangeLog:
* rust/compile/repeated_constructor_fields.rs: Added case with
constructor field repeated
Signed-off-by: Robert Goss <goss.rob...@gmail.com>
---
.../rust-hir-type-check-struct-field.h | 6 +-
.../typecheck/rust-hir-type-check-struct.cc | 90 +++++++++++++------
.../compile/repeated_constructor_fields.rs | 10 +++
3 files changed, 74 insertions(+), 32 deletions(-)
create mode 100644 gcc/testsuite/rust/compile/repeated_constructor_fields.rs
diff --git a/gcc/rust/typecheck/rust-hir-type-check-struct-field.h
b/gcc/rust/typecheck/rust-hir-type-check-struct-field.h
index 923c7077f28..31d2896d0bb 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-struct-field.h
+++ b/gcc/rust/typecheck/rust-hir-type-check-struct-field.h
@@ -35,9 +35,9 @@ public:
protected:
void resolve (HIR::StructExprStructFields &struct_expr);
- void visit (HIR::StructExprFieldIdentifierValue &field);
- void visit (HIR::StructExprFieldIndexValue &field);
- void visit (HIR::StructExprFieldIdentifier &field);
+ bool visit (HIR::StructExprFieldIdentifierValue &field);
+ bool visit (HIR::StructExprFieldIndexValue &field);
+ bool visit (HIR::StructExprFieldIdentifier &field);
private:
TypeCheckStructExpr (HIR::Expr *e);
diff --git a/gcc/rust/typecheck/rust-hir-type-check-struct.cc
b/gcc/rust/typecheck/rust-hir-type-check-struct.cc
index f2dd8b6aa6e..56aa3d869a4 100644
--- a/gcc/rust/typecheck/rust-hir-type-check-struct.cc
+++ b/gcc/rust/typecheck/rust-hir-type-check-struct.cc
@@ -102,19 +102,26 @@ TypeCheckStructExpr::resolve (HIR::StructExprStructFields
&struct_expr)
switch (field->get_kind ())
{
case HIR::StructExprField::StructExprFieldKind::IDENTIFIER:
- visit (static_cast<HIR::StructExprFieldIdentifier &> (*field.get ()));
+ ok = visit (
+ static_cast<HIR::StructExprFieldIdentifier &> (*field.get ()));
break;
case HIR::StructExprField::StructExprFieldKind::IDENTIFIER_VALUE:
- visit (
+ ok = visit (
static_cast<HIR::StructExprFieldIdentifierValue &> (*field.get ()));
break;
case HIR::StructExprField::StructExprFieldKind::INDEX_VALUE:
- visit (static_cast<HIR::StructExprFieldIndexValue &> (*field.get ()));
+ ok = visit (
+ static_cast<HIR::StructExprFieldIndexValue &> (*field.get ()));
break;
}
+ if (!ok)
+ {
+ return;
+ }
+
if (resolved_field_value_expr == nullptr)
{
rust_fatal_error (field->get_locus (),
@@ -238,16 +245,9 @@ TypeCheckStructExpr::resolve (HIR::StructExprStructFields
&struct_expr)
resolved = struct_def;
}
-void
+bool
TypeCheckStructExpr::visit (HIR::StructExprFieldIdentifierValue &field)
{
- auto it = fields_assigned.find (field.field_name.as_string ());
- if (it != fields_assigned.end ())
- {
- rust_fatal_error (field.get_locus (), "used more than once");
- return;
- }
-
size_t field_index;
TyTy::StructFieldType *field_type;
bool ok = variant->lookup_field (field.field_name.as_string (), &field_type,
@@ -255,7 +255,20 @@ TypeCheckStructExpr::visit
(HIR::StructExprFieldIdentifierValue &field)
if (!ok)
{
rust_error_at (field.get_locus (), "unknown field");
- return;
+ return true;
+ }
+
+ auto it = adtFieldIndexToField.find (field_index);
+ if (it != adtFieldIndexToField.end ())
+ {
+ rich_location repeat_location (line_table, field.get_locus ());
+ auto prev_field_locus = it->second->get_locus ();
+ repeat_location.add_range (prev_field_locus);
+
+ rust_error_at (repeat_location, ErrorCode::E0062,
+ "field %<%s%> specified more than once",
+ field.field_name.as_string ().c_str ());
+ return false;
}
TyTy::BaseType *value = TypeCheckExpr::Resolve (field.get_value ().get ());
@@ -273,18 +286,14 @@ TypeCheckStructExpr::visit
(HIR::StructExprFieldIdentifierValue &field)
fields_assigned.insert (field.field_name.as_string ());
adtFieldIndexToField[field_index] = &field;
}
+
+ return true;
}
-void
+bool
TypeCheckStructExpr::visit (HIR::StructExprFieldIndexValue &field)
{
std::string field_name (std::to_string (field.get_tuple_index ()));
- auto it = fields_assigned.find (field_name);
- if (it != fields_assigned.end ())
- {
- rust_fatal_error (field.get_locus (), "used more than once");
- return;
- }
size_t field_index;
TyTy::StructFieldType *field_type;
@@ -292,7 +301,20 @@ TypeCheckStructExpr::visit (HIR::StructExprFieldIndexValue
&field)
if (!ok)
{
rust_error_at (field.get_locus (), "unknown field");
- return;
+ return true;
+ }
+
+ auto it = adtFieldIndexToField.find (field_index);
+ if (it != adtFieldIndexToField.end ())
+ {
+ rich_location repeat_location (line_table, field.get_locus ());
+ auto prev_field_locus = it->second->get_locus ();
+ repeat_location.add_range (prev_field_locus);
+
+ rust_error_at (repeat_location, ErrorCode::E0062,
+ "field %<%s%> specified more than once",
+ field_name.c_str ());
+ return false;
}
TyTy::BaseType *value = TypeCheckExpr::Resolve (field.get_value ().get ());
@@ -310,18 +332,13 @@ TypeCheckStructExpr::visit
(HIR::StructExprFieldIndexValue &field)
fields_assigned.insert (field_name);
adtFieldIndexToField[field_index] = &field;
}
+
+ return true;
}
-void
+bool
TypeCheckStructExpr::visit (HIR::StructExprFieldIdentifier &field)
{
- auto it = fields_assigned.find (field.get_field_name ().as_string ());
- if (it != fields_assigned.end ())
- {
- rust_fatal_error (field.get_locus (), "used more than once");
- return;
- }
-
size_t field_index;
TyTy::StructFieldType *field_type;
bool ok = variant->lookup_field (field.get_field_name ().as_string (),
@@ -329,7 +346,20 @@ TypeCheckStructExpr::visit (HIR::StructExprFieldIdentifier
&field)
if (!ok)
{
rust_error_at (field.get_locus (), "unknown field");
- return;
+ return true;
+ }
+
+ auto it = adtFieldIndexToField.find (field_index);
+ if (it != adtFieldIndexToField.end ())
+ {
+ rich_location repeat_location (line_table, field.get_locus ());
+ auto prev_field_locus = it->second->get_locus ();
+ repeat_location.add_range (prev_field_locus);
+
+ rust_error_at (repeat_location, ErrorCode::E0062,
+ "field %<%s%> specified more than once",
+ field.get_field_name ().as_string ().c_str ());
+ return false;
}
// we can make the field look like a path expr to take advantage of existing
@@ -358,6 +388,8 @@ TypeCheckStructExpr::visit (HIR::StructExprFieldIdentifier
&field)
fields_assigned.insert (field.get_field_name ().as_string ());
adtFieldIndexToField[field_index] = &field;
}
+
+ return true;
}
} // namespace Resolver
diff --git a/gcc/testsuite/rust/compile/repeated_constructor_fields.rs
b/gcc/testsuite/rust/compile/repeated_constructor_fields.rs
new file mode 100644
index 00000000000..729001b6e3c
--- /dev/null
+++ b/gcc/testsuite/rust/compile/repeated_constructor_fields.rs
@@ -0,0 +1,10 @@
+struct Foo {
+ x: i32,
+}
+
+fn main() {
+ let x = Foo {
+ x: 0,
+ x: 0, // { dg-error "field 'x' specified more than once" }
+ };
+}
--
2.42.1
