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235cb88a8e775b27495baabfd1f95f4971ecf905
carbon-lang/explorer/interpreter/value.cpp
T
Richard SmithGeoff RomerJon Meow
 235cb88a8e Compound member access syntax. (#1233) 
Implement initial support for `A.(B)` syntax, per #989. Specifically, this supports:

* `object.(Type.member)` for instance members,
* `object.(Interface.member)` for instance and non-instance members,
* `object.(Type.(Interface.member))` for instance members,
* `Type.(Interface.member)` for non-instance members.

Three new AST nodes are introduced:

* `CompoundFieldAccessExpression` represents the `A.(B)` syntax.
* `MemberName` is a `Value` that represents the result of evaluating an expression such as `Type.member` or `Interface.member` or `Type.(Interface.member)`.
* `TypeOfMemberName` is the type of a `MemberName` value.

In order to handle members of classes and interfaces which have corresponding declarations and may need substitution into their types, and members of structs which don't have declarations but also don't need substitution, a class `Member` is introduced that can refer to either of these kinds of member.

Co-authored-by: Geoff Romer <gromer@google.com>
Co-authored-by: Jon Meow <jperkins@google.com>
2022-05-13 16:52:41 -07:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "explorer/interpreter/value.h"
#include <algorithm>
#include "common/check.h"
#include "explorer/common/arena.h"
#include "explorer/common/error_builders.h"
#include "explorer/interpreter/action.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Error.h"
namespace Carbon {
using llvm::cast;
auto StructValue::FindField(const std::string& name) const
-> std::optional<Nonnull<const Value*>> {
for (const NamedValue& element : elements_) {
if (element.name == name) {
return element.value;
}
}
return std::nullopt;
}
static auto GetMember(Nonnull<Arena*> arena, Nonnull<const Value*> v,
const FieldPath::Component& field,
SourceLocation source_loc)
-> ErrorOr<Nonnull<const Value*>> {
const std::string& f = field.name();
if (field.witness().has_value()) {
Nonnull<const Witness*> witness = *field.witness();
switch (witness->kind()) {
case Value::Kind::Witness: {
if (std::optional<Nonnull<const Declaration*>> mem_decl =
FindMember(f, witness->declaration().members());
mem_decl.has_value()) {
const auto& fun_decl = cast<FunctionDeclaration>(**mem_decl);
if (fun_decl.is_method()) {
return arena->New<BoundMethodValue>(
&fun_decl, v, witness->type_args(), witness->witnesses());
} else {
// Class function.
auto fun = cast<FunctionValue>(*fun_decl.constant_value());
return arena->New<FunctionValue>(&fun->declaration(),
witness->type_args(),
witness->witnesses());
}
} else {
return CompilationError(source_loc)
<< "member " << f << " not in " << *witness;
}
}
default:
CARBON_FATAL() << "expected Witness, not " << *witness;
}
}
switch (v->kind()) {
case Value::Kind::StructValue: {
std::optional<Nonnull<const Value*>> field =
cast<StructValue>(*v).FindField(f);
if (field == std::nullopt) {
return RuntimeError(source_loc) << "member " << f << " not in " << *v;
}
return *field;
}
case Value::Kind::NominalClassValue: {
const auto& object = cast<NominalClassValue>(*v);
// Look for a field
std::optional<Nonnull<const Value*>> field =
cast<StructValue>(object.inits()).FindField(f);
if (field.has_value()) {
return *field;
} else {
// Look for a method in the object's class
const auto& class_type = cast<NominalClassType>(object.type());
std::optional<Nonnull<const FunctionValue*>> func =
class_type.FindFunction(f);
if (func == std::nullopt) {
return RuntimeError(source_loc) << "member " << f << " not in " << *v
<< " or its " << class_type;
} else if ((*func)->declaration().is_method()) {
// Found a method. Turn it into a bound method.
const FunctionValue& m = cast<FunctionValue>(**func);
return arena->New<BoundMethodValue>(&m.declaration(), &object,
class_type.type_args(),
class_type.witnesses());
} else {
// Found a class function
return arena->New<FunctionValue>(&(*func)->declaration(),
class_type.type_args(),
class_type.witnesses());
}
}
}
case Value::Kind::ChoiceType: {
const auto& choice = cast<ChoiceType>(*v);
if (!choice.FindAlternative(f)) {
return RuntimeError(source_loc)
<< "alternative " << f << " not in " << *v;
}
return arena->New<AlternativeConstructorValue>(f, choice.name());
}
case Value::Kind::NominalClassType: {
// Access a class function.
const NominalClassType& class_type = cast<NominalClassType>(*v);
std::optional<Nonnull<const FunctionValue*>> fun =
class_type.FindFunction(f);
if (fun == std::nullopt) {
return RuntimeError(source_loc)
<< "class function " << f << " not in " << *v;
}
return arena->New<FunctionValue>(&(*fun)->declaration(),
class_type.type_args(),
class_type.witnesses());
}
default:
CARBON_FATAL() << "field access not allowed for value " << *v;
}
}
auto Value::GetField(Nonnull<Arena*> arena, const FieldPath& path,
SourceLocation source_loc) const
-> ErrorOr<Nonnull<const Value*>> {
Nonnull<const Value*> value(this);
for (const FieldPath::Component& field : path.components_) {
CARBON_ASSIGN_OR_RETURN(value, GetMember(arena, value, field, source_loc));
}
return value;
}
static auto SetFieldImpl(
Nonnull<Arena*> arena, Nonnull<const Value*> value,
std::vector<FieldPath::Component>::const_iterator path_begin,
std::vector<FieldPath::Component>::const_iterator path_end,
Nonnull<const Value*> field_value, SourceLocation source_loc)
-> ErrorOr<Nonnull<const Value*>> {
if (path_begin == path_end) {
return field_value;
}
switch (value->kind()) {
case Value::Kind::StructValue: {
std::vector<NamedValue> elements = cast<StructValue>(*value).elements();
auto it = std::find_if(elements.begin(), elements.end(),
[path_begin](const NamedValue& element) {
return element.name == (*path_begin).name();
});
if (it == elements.end()) {
return RuntimeError(source_loc)
<< "field " << (*path_begin).name() << " not in " << *value;
}
CARBON_ASSIGN_OR_RETURN(
it->value, SetFieldImpl(arena, it->value, path_begin + 1, path_end,
field_value, source_loc));
return arena->New<StructValue>(elements);
}
case Value::Kind::NominalClassValue: {
return SetFieldImpl(arena, &cast<NominalClassValue>(*value).inits(),
path_begin, path_end, field_value, source_loc);
}
case Value::Kind::TupleValue: {
std::vector<Nonnull<const Value*>> elements =
cast<TupleValue>(*value).elements();
// TODO(geoffromer): update FieldPath to hold integers as well as strings.
int index = std::stoi((*path_begin).name());
if (index < 0 || static_cast<size_t>(index) >= elements.size()) {
return RuntimeError(source_loc) << "index " << (*path_begin).name()
<< " out of range in " << *value;
}
CARBON_ASSIGN_OR_RETURN(
elements[index], SetFieldImpl(arena, elements[index], path_begin + 1,
path_end, field_value, source_loc));
return arena->New<TupleValue>(elements);
}
default:
CARBON_FATAL() << "field access not allowed for value " << *value;
}
}
auto Value::SetField(Nonnull<Arena*> arena, const FieldPath& path,
Nonnull<const Value*> field_value,
SourceLocation source_loc) const
-> ErrorOr<Nonnull<const Value*>> {
return SetFieldImpl(arena, Nonnull<const Value*>(this),
path.components_.begin(), path.components_.end(),
field_value, source_loc);
}
void Value::Print(llvm::raw_ostream& out) const {
switch (kind()) {
case Value::Kind::AlternativeConstructorValue: {
const auto& alt = cast<AlternativeConstructorValue>(*this);
out << alt.choice_name() << "." << alt.alt_name();
break;
}
case Value::Kind::BindingPlaceholderValue: {
const auto& placeholder = cast<BindingPlaceholderValue>(*this);
out << "Placeholder<";
if (placeholder.value_node().has_value()) {
out << (*placeholder.value_node());
} else {
out << "_";
}
out << ">";
break;
}
case Value::Kind::AlternativeValue: {
const auto& alt = cast<AlternativeValue>(*this);
out << "alt " << alt.choice_name() << "." << alt.alt_name() << " "
<< alt.argument();
break;
}
case Value::Kind::StructValue: {
const auto& struct_val = cast<StructValue>(*this);
out << "{";
llvm::ListSeparator sep;
for (const NamedValue& element : struct_val.elements()) {
out << sep << "." << element.name << " = " << *element.value;
}
out << "}";
break;
}
case Value::Kind::NominalClassValue: {
const auto& s = cast<NominalClassValue>(*this);
out << cast<NominalClassType>(s.type()).declaration().name() << s.inits();
break;
}
case Value::Kind::TupleValue: {
out << "(";
llvm::ListSeparator sep;
for (Nonnull<const Value*> element : cast<TupleValue>(*this).elements()) {
out << sep << *element;
}
out << ")";
break;
}
case Value::Kind::IntValue:
out << cast<IntValue>(*this).value();
break;
case Value::Kind::BoolValue:
out << (cast<BoolValue>(*this).value() ? "true" : "false");
break;
case Value::Kind::FunctionValue:
out << "fun<" << cast<FunctionValue>(*this).declaration().name() << ">";
break;
case Value::Kind::BoundMethodValue:
out << "bound_method<"
<< cast<BoundMethodValue>(*this).declaration().name() << ">";
break;
case Value::Kind::PointerValue:
out << "ptr<" << cast<PointerValue>(*this).address() << ">";
break;
case Value::Kind::LValue:
out << "lval<" << cast<LValue>(*this).address() << ">";
break;
case Value::Kind::BoolType:
out << "Bool";
break;
case Value::Kind::IntType:
out << "i32";
break;
case Value::Kind::TypeType:
out << "Type";
break;
case Value::Kind::AutoType:
out << "auto";
break;
case Value::Kind::ContinuationType:
out << "Continuation";
break;
case Value::Kind::PointerType:
out << cast<PointerType>(*this).type() << "*";
break;
case Value::Kind::FunctionType: {
const auto& fn_type = cast<FunctionType>(*this);
out << "fn ";
if (!fn_type.deduced_bindings().empty()) {
out << "[";
unsigned int i = 0;
for (Nonnull<const GenericBinding*> deduced :
fn_type.deduced_bindings()) {
if (i != 0) {
out << ", ";
}
out << deduced->name() << ":! " << deduced->type();
++i;
}
out << "]";
}
out << fn_type.parameters() << " -> " << fn_type.return_type();
break;
}
case Value::Kind::StructType: {
out << "{";
llvm::ListSeparator sep;
for (const auto& [name, type] : cast<StructType>(*this).fields()) {
out << sep << "." << name << ": " << *type;
}
out << "}";
break;
}
case Value::Kind::NominalClassType: {
const auto& class_type = cast<NominalClassType>(*this);
out << "class " << class_type.declaration().name();
if (!class_type.type_args().empty()) {
out << "(";
llvm::ListSeparator sep;
for (const auto& [bind, val] : class_type.type_args()) {
out << sep << bind->name() << " = " << *val;
}
out << ")";
}
if (!class_type.impls().empty()) {
out << " impls ";
llvm::ListSeparator sep;
for (const auto& [impl_bind, impl] : class_type.impls()) {
out << sep << *impl;
}
}
if (!class_type.witnesses().empty()) {
out << " witnesses ";
llvm::ListSeparator sep;
for (const auto& [impl_bind, witness] : class_type.witnesses()) {
out << sep << *witness;
}
}
break;
}
case Value::Kind::InterfaceType: {
const auto& iface_type = cast<InterfaceType>(*this);
out << "interface " << iface_type.declaration().name();
if (!iface_type.args().empty()) {
out << "(";
llvm::ListSeparator sep;
for (const auto& [bind, val] : iface_type.args()) {
out << sep << bind->name() << " = " << *val;
}
out << ")";
}
break;
}
case Value::Kind::Witness: {
const auto& witness = cast<Witness>(*this);
out << "witness " << *witness.declaration().impl_type() << " as "
<< witness.declaration().interface();
break;
}
case Value::Kind::ParameterizedEntityName:
out << *GetName(cast<ParameterizedEntityName>(*this).declaration());
break;
case Value::Kind::MemberName: {
const auto& member_name = cast<MemberName>(*this);
if (member_name.base_type().has_value()) {
out << *member_name.base_type().value();
}
if (member_name.base_type().has_value() &&
member_name.interface().has_value()) {
out << "(";
}
if (member_name.interface().has_value()) {
out << *member_name.interface().value();
}
out << "." << member_name.name();
if (member_name.base_type().has_value() &&
member_name.interface().has_value()) {
out << ")";
}
break;
}
case Value::Kind::ChoiceType:
out << "choice " << cast<ChoiceType>(*this).name();
break;
case Value::Kind::VariableType:
out << cast<VariableType>(*this).binding();
break;
case Value::Kind::ContinuationValue: {
out << cast<ContinuationValue>(*this).stack();
break;
}
case Value::Kind::StringType:
out << "String";
break;
case Value::Kind::StringValue:
out << "\"";
out.write_escaped(cast<StringValue>(*this).value());
out << "\"";
break;
case Value::Kind::TypeOfClassType:
out << "typeof(" << cast<TypeOfClassType>(*this).class_type() << ")";
break;
case Value::Kind::TypeOfInterfaceType:
out << "typeof("
<< cast<TypeOfInterfaceType>(*this)
.interface_type()
.declaration()
.name()
<< ")";
break;
case Value::Kind::TypeOfChoiceType:
out << "typeof(" << cast<TypeOfChoiceType>(*this).choice_type().name()
<< ")";
break;
case Value::Kind::TypeOfParameterizedEntityName:
out << "parameterized entity name "
<< cast<TypeOfParameterizedEntityName>(*this).name();
break;
case Value::Kind::TypeOfMemberName: {
out << "member name " << cast<TypeOfMemberName>(*this).member().name();
break;
}
case Value::Kind::StaticArrayType: {
const auto& array_type = cast<StaticArrayType>(*this);
out << "[" << array_type.element_type() << "; " << array_type.size()
<< "]";
break;
}
}
}
ContinuationValue::StackFragment::~StackFragment() {
CARBON_CHECK(reversed_todo_.empty())
<< "All StackFragments must be empty before the Carbon program ends.";
}
void ContinuationValue::StackFragment::StoreReversed(
std::vector<std::unique_ptr<Action>> reversed_todo) {
CARBON_CHECK(reversed_todo_.empty());
reversed_todo_ = std::move(reversed_todo);
}
void ContinuationValue::StackFragment::RestoreTo(
Stack<std::unique_ptr<Action>>& todo) {
while (!reversed_todo_.empty()) {
todo.Push(std::move(reversed_todo_.back()));
reversed_todo_.pop_back();
}
}
void ContinuationValue::StackFragment::Clear() {
// We destroy the underlying Actions explicitly to ensure they're
// destroyed in the correct order.
for (auto& action : reversed_todo_) {
action.reset();
}
reversed_todo_.clear();
}
void ContinuationValue::StackFragment::Print(llvm::raw_ostream& out) const {
out << "{";
llvm::ListSeparator sep(" :: ");
for (const std::unique_ptr<Action>& action : reversed_todo_) {
out << sep << *action;
}
out << "}";
}
auto TypeEqual(Nonnull<const Value*> t1, Nonnull<const Value*> t2) -> bool {
if (t1->kind() != t2->kind()) {
return false;
}
switch (t1->kind()) {
case Value::Kind::PointerType:
return TypeEqual(&cast<PointerType>(*t1).type(),
&cast<PointerType>(*t2).type());
case Value::Kind::FunctionType: {
const auto& fn1 = cast<FunctionType>(*t1);
const auto& fn2 = cast<FunctionType>(*t2);
return TypeEqual(&fn1.parameters(), &fn2.parameters()) &&
TypeEqual(&fn1.return_type(), &fn2.return_type());
}
case Value::Kind::StructType: {
const auto& struct1 = cast<StructType>(*t1);
const auto& struct2 = cast<StructType>(*t2);
if (struct1.fields().size() != struct2.fields().size()) {
return false;
}
for (size_t i = 0; i < struct1.fields().size(); ++i) {
if (struct1.fields()[i].name != struct2.fields()[i].name ||
!TypeEqual(struct1.fields()[i].value, struct2.fields()[i].value)) {
return false;
}
}
return true;
}
case Value::Kind::NominalClassType:
if (cast<NominalClassType>(*t1).declaration().name() !=
cast<NominalClassType>(*t2).declaration().name()) {
return false;
}
for (const auto& [ty_var1, ty1] :
cast<NominalClassType>(*t1).type_args()) {
if (!ValueEqual(ty1,
cast<NominalClassType>(*t2).type_args().at(ty_var1))) {
return false;
}
}
return true;
case Value::Kind::InterfaceType:
if (cast<InterfaceType>(*t1).declaration().name() !=
cast<InterfaceType>(*t2).declaration().name()) {
return false;
}
for (const auto& [ty_var1, ty1] : cast<InterfaceType>(*t1).args()) {
if (!ValueEqual(ty1, cast<InterfaceType>(*t2).args().at(ty_var1))) {
return false;
}
}
return true;
case Value::Kind::ChoiceType:
return cast<ChoiceType>(*t1).name() == cast<ChoiceType>(*t2).name();
case Value::Kind::TupleValue: {
const auto& tup1 = cast<TupleValue>(*t1);
const auto& tup2 = cast<TupleValue>(*t2);
if (tup1.elements().size() != tup2.elements().size()) {
return false;
}
for (size_t i = 0; i < tup1.elements().size(); ++i) {
if (!TypeEqual(tup1.elements()[i], tup2.elements()[i])) {
return false;
}
}
return true;
}
case Value::Kind::IntType:
case Value::Kind::BoolType:
case Value::Kind::ContinuationType:
case Value::Kind::TypeType:
case Value::Kind::StringType:
return true;
case Value::Kind::VariableType:
return &cast<VariableType>(*t1).binding() ==
&cast<VariableType>(*t2).binding();
case Value::Kind::TypeOfClassType:
return TypeEqual(&cast<TypeOfClassType>(*t1).class_type(),
&cast<TypeOfClassType>(*t2).class_type());
case Value::Kind::TypeOfInterfaceType:
return TypeEqual(&cast<TypeOfInterfaceType>(*t1).interface_type(),
&cast<TypeOfInterfaceType>(*t2).interface_type());
case Value::Kind::TypeOfChoiceType:
return TypeEqual(&cast<TypeOfChoiceType>(*t1).choice_type(),
&cast<TypeOfChoiceType>(*t2).choice_type());
case Value::Kind::StaticArrayType: {
const auto& array1 = cast<StaticArrayType>(*t1);
const auto& array2 = cast<StaticArrayType>(*t2);
return TypeEqual(&array1.element_type(), &array2.element_type()) &&
array1.size() == array2.size();
}
case Value::Kind::IntValue:
case Value::Kind::BoolValue:
case Value::Kind::FunctionValue:
case Value::Kind::BoundMethodValue:
case Value::Kind::StructValue:
case Value::Kind::NominalClassValue:
case Value::Kind::AlternativeValue:
case Value::Kind::AlternativeConstructorValue:
case Value::Kind::StringValue:
case Value::Kind::PointerValue:
case Value::Kind::LValue:
case Value::Kind::BindingPlaceholderValue:
case Value::Kind::ContinuationValue:
case Value::Kind::ParameterizedEntityName:
case Value::Kind::MemberName:
case Value::Kind::TypeOfParameterizedEntityName:
case Value::Kind::TypeOfMemberName:
CARBON_FATAL() << "TypeEqual used to compare non-type values\n"
<< *t1 << "\n"
<< *t2;
case Value::Kind::Witness:
CARBON_FATAL() << "TypeEqual: unexpected Witness";
break;
case Value::Kind::AutoType:
CARBON_FATAL() << "TypeEqual: unexpected AutoType";
break;
}
}
// Returns true if the two values are equal and returns false otherwise.
//
// This function implements the `==` operator of Carbon.
auto ValueEqual(Nonnull<const Value*> v1, Nonnull<const Value*> v2) -> bool {
if (v1->kind() != v2->kind()) {
return false;
}
switch (v1->kind()) {
case Value::Kind::IntValue:
return cast<IntValue>(*v1).value() == cast<IntValue>(*v2).value();
case Value::Kind::BoolValue:
return cast<BoolValue>(*v1).value() == cast<BoolValue>(*v2).value();
case Value::Kind::FunctionValue: {
std::optional<Nonnull<const Statement*>> body1 =
cast<FunctionValue>(*v1).declaration().body();
std::optional<Nonnull<const Statement*>> body2 =
cast<FunctionValue>(*v2).declaration().body();
return body1.has_value() == body2.has_value() &&
(!body1.has_value() || *body1 == *body2);
}
case Value::Kind::BoundMethodValue: {
const auto& m1 = cast<BoundMethodValue>(*v1);
const auto& m2 = cast<BoundMethodValue>(*v2);
std::optional<Nonnull<const Statement*>> body1 = m1.declaration().body();
std::optional<Nonnull<const Statement*>> body2 = m2.declaration().body();
return ValueEqual(m1.receiver(), m2.receiver()) &&
body1.has_value() == body2.has_value() &&
(!body1.has_value() || *body1 == *body2);
}
case Value::Kind::TupleValue: {
const std::vector<Nonnull<const Value*>>& elements1 =
cast<TupleValue>(*v1).elements();
const std::vector<Nonnull<const Value*>>& elements2 =
cast<TupleValue>(*v2).elements();
if (elements1.size() != elements2.size()) {
return false;
}
for (size_t i = 0; i < elements1.size(); ++i) {
if (!ValueEqual(elements1[i], elements2[i])) {
return false;
}
}
return true;
}
case Value::Kind::StructValue: {
const auto& struct_v1 = cast<StructValue>(*v1);
const auto& struct_v2 = cast<StructValue>(*v2);
CARBON_CHECK(struct_v1.elements().size() == struct_v2.elements().size());
for (size_t i = 0; i < struct_v1.elements().size(); ++i) {
CARBON_CHECK(struct_v1.elements()[i].name ==
struct_v2.elements()[i].name);
if (!ValueEqual(struct_v1.elements()[i].value,
struct_v2.elements()[i].value)) {
return false;
}
}
return true;
}
case Value::Kind::StringValue:
return cast<StringValue>(*v1).value() == cast<StringValue>(*v2).value();
case Value::Kind::ParameterizedEntityName: {
std::optional<std::string> name1 =
GetName(cast<ParameterizedEntityName>(v1)->declaration());
std::optional<std::string> name2 =
GetName(cast<ParameterizedEntityName>(v2)->declaration());
CARBON_CHECK(name1.has_value() && name2.has_value())
<< "parameterized name refers to unnamed declaration";
return *name1 == *name2;
}
case Value::Kind::IntType:
case Value::Kind::BoolType:
case Value::Kind::TypeType:
case Value::Kind::FunctionType:
case Value::Kind::PointerType:
case Value::Kind::AutoType:
case Value::Kind::StructType:
case Value::Kind::NominalClassType:
case Value::Kind::InterfaceType:
case Value::Kind::Witness:
case Value::Kind::ChoiceType:
case Value::Kind::ContinuationType:
case Value::Kind::VariableType:
case Value::Kind::StringType:
case Value::Kind::TypeOfClassType:
case Value::Kind::TypeOfInterfaceType:
case Value::Kind::TypeOfChoiceType:
case Value::Kind::TypeOfParameterizedEntityName:
case Value::Kind::TypeOfMemberName:
case Value::Kind::StaticArrayType:
return TypeEqual(v1, v2);
case Value::Kind::NominalClassValue:
case Value::Kind::AlternativeValue:
case Value::Kind::BindingPlaceholderValue:
case Value::Kind::AlternativeConstructorValue:
case Value::Kind::ContinuationValue:
case Value::Kind::PointerValue:
case Value::Kind::LValue:
case Value::Kind::MemberName:
// TODO: support pointer comparisons once we have a clearer distinction
// between pointers and lvalues.
CARBON_FATAL() << "ValueEqual does not support this kind of value: "
<< *v1;
}
}
auto ChoiceType::FindAlternative(std::string_view name) const
-> std::optional<Nonnull<const Value*>> {
for (const NamedValue& alternative : alternatives_) {
if (alternative.name == name) {
return alternative.value;
}
}
return std::nullopt;
}
auto NominalClassType::FindFunction(const std::string& name) const
-> std::optional<Nonnull<const FunctionValue*>> {
for (const auto& member : declaration().members()) {
switch (member->kind()) {
case DeclarationKind::FunctionDeclaration: {
const auto& fun = cast<FunctionDeclaration>(*member);
if (fun.name() == name) {
return &cast<FunctionValue>(**fun.constant_value());
}
break;
}
default:
break;
}
}
return std::nullopt;
}
auto FindMember(const std::string& name,
llvm::ArrayRef<Nonnull<Declaration*>> members)
-> std::optional<Nonnull<const Declaration*>> {
for (Nonnull<const Declaration*> member : members) {
if (std::optional<std::string> mem_name = GetName(*member);
mem_name.has_value()) {
if (*mem_name == name) {
return member;
}
}
}
return std::nullopt;
}
auto Member::name() const -> std::string {
if (const Declaration* decl = member_.dyn_cast<const Declaration*>()) {
return GetName(*decl).value();
} else {
return member_.get<const NamedValue*>()->name;
}
}
auto Member::type() const -> const Value& {
if (const Declaration* decl = member_.dyn_cast<const Declaration*>()) {
return decl->static_type();
} else {
return *member_.get<const NamedValue*>()->value;
}
}
void ImplBinding::Print(llvm::raw_ostream& out) const {
out << "impl binding " << *type_var_ << " as " << *iface_;
}
void ImplBinding::PrintID(llvm::raw_ostream& out) const {
out << *type_var_ << " as " << *iface_;
}
} // namespace Carbon
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