mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 08:10:10 +01:00
Geoff Romer
de05711966
Also: - Switch data members, and associated parameters and return types to be values/references rather than pointers, where applicable. - Move Expression's TagVisitor to anonymous namespace, to avoid name collision. - Switch to trailing return syntax (per style guide).
478 lines
13 KiB
C++
478 lines
13 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "executable_semantics/interpreter/value.h"
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#include <algorithm>
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#include <iostream>
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#include "common/check.h"
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#include "executable_semantics/interpreter/interpreter.h"
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namespace Carbon {
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namespace {
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struct TagVisitor {
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template <typename Alternative>
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auto operator()(const Alternative&) -> ValKind {
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return Alternative::Kind;
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}
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};
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} // namespace
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auto Value::tag() const -> ValKind { return std::visit(TagVisitor(), value); }
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auto Value::GetIntValue() const -> int {
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return std::get<IntValue>(value).value;
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}
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auto Value::GetBoolValue() const -> bool {
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return std::get<BoolValue>(value).value;
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}
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auto Value::GetFunctionValue() const -> const FunctionValue& {
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return std::get<FunctionValue>(value);
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}
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auto Value::GetStructValue() const -> const StructValue& {
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return std::get<StructValue>(value);
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}
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auto Value::GetAlternativeConstructorValue() const
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-> const AlternativeConstructorValue& {
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return std::get<AlternativeConstructorValue>(value);
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}
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auto Value::GetAlternativeValue() const -> const AlternativeValue& {
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return std::get<AlternativeValue>(value);
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}
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auto Value::GetTupleValue() const -> const TupleValue& {
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return std::get<TupleValue>(value);
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}
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auto Value::GetPointerValue() const -> Address {
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return std::get<PointerValue>(value).value;
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}
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auto Value::GetBindingPlaceholderValue() const
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-> const BindingPlaceholderValue& {
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return std::get<BindingPlaceholderValue>(value);
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}
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auto Value::GetFunctionType() const -> const FunctionType& {
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return std::get<FunctionType>(value);
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}
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auto Value::GetPointerType() const -> const PointerType& {
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return std::get<PointerType>(value);
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}
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auto Value::GetStructType() const -> const StructType& {
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return std::get<StructType>(value);
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}
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auto Value::GetChoiceType() const -> const ChoiceType& {
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return std::get<ChoiceType>(value);
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}
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auto Value::GetContinuationValue() const -> const ContinuationValue& {
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return std::get<ContinuationValue>(value);
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}
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auto FindInVarValues(const std::string& field, const VarValues& inits)
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-> const Value* {
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for (auto& i : inits) {
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if (i.first == field) {
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return i.second;
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}
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}
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return nullptr;
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}
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auto FieldsEqual(const VarValues& ts1, const VarValues& ts2) -> bool {
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if (ts1.size() == ts2.size()) {
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for (auto& iter1 : ts1) {
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auto t2 = FindInVarValues(iter1.first, ts2);
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if (t2 == nullptr) {
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return false;
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}
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if (!TypeEqual(iter1.second, t2)) {
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return false;
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}
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}
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return true;
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} else {
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return false;
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}
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}
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auto FindTupleField(const std::string& name, const Value* tuple)
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-> std::optional<Address> {
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CHECK(tuple->tag() == ValKind::TupleValue);
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for (const TupleElement& element : tuple->GetTupleValue().elements) {
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if (element.name == name) {
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return element.address;
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}
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}
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return std::nullopt;
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}
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auto Value::MakeIntValue(int i) -> const Value* {
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auto* v = new Value();
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v->value = IntValue({.value = i});
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return v;
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}
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auto Value::MakeBoolValue(bool b) -> const Value* {
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auto* v = new Value();
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v->value = BoolValue({.value = b});
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return v;
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}
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auto Value::MakeFunctionValue(std::string name, const Value* param,
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const Statement* body) -> const Value* {
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auto* v = new Value();
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v->value =
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FunctionValue({.name = std::move(name), .param = param, .body = body});
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return v;
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}
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auto Value::MakePointerValue(Address addr) -> const Value* {
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auto* v = new Value();
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v->value = PointerValue({.value = addr});
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return v;
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}
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auto Value::MakeStructValue(const Value* type, const Value* inits)
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-> const Value* {
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auto* v = new Value();
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v->value = StructValue({.type = type, .inits = inits});
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return v;
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}
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auto Value::MakeTupleValue(std::vector<TupleElement> elements) -> const Value* {
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auto* v = new Value();
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v->value = TupleValue({.elements = std::move(elements)});
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return v;
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}
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auto Value::MakeAlternativeValue(std::string alt_name, std::string choice_name,
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Address argument) -> const Value* {
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auto* v = new Value();
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v->value = AlternativeValue({.alt_name = std::move(alt_name),
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.choice_name = std::move(choice_name),
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.argument = argument});
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return v;
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}
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auto Value::MakeAlternativeConstructorValue(std::string alt_name,
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std::string choice_name)
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-> const Value* {
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auto* v = new Value();
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v->value = AlternativeConstructorValue(
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{.alt_name = std::move(alt_name), .choice_name = std::move(choice_name)});
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return v;
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}
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// Return a first-class continuation represented a fragment
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// of the stack.
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auto Value::MakeContinuationValue(std::vector<Frame*> stack) -> Value* {
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auto* v = new Value();
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v->value = ContinuationValue({.stack = std::move(stack)});
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return v;
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}
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auto Value::MakeBindingPlaceholderValue(std::string name, const Value* type)
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-> const Value* {
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auto* v = new Value();
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v->value = BindingPlaceholderValue({.name = std::move(name), .type = type});
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return v;
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}
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auto Value::MakeIntType() -> const Value* {
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auto* v = new Value();
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v->value = IntType();
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return v;
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}
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auto Value::MakeBoolType() -> const Value* {
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auto* v = new Value();
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v->value = BoolType();
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return v;
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}
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auto Value::MakeTypeType() -> const Value* {
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auto* v = new Value();
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v->value = TypeType();
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return v;
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}
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// Return a Continuation type.
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auto Value::MakeContinuationType() -> const Value* {
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auto* v = new Value();
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v->value = ContinuationType();
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return v;
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}
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auto Value::MakeAutoType() -> const Value* {
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auto* v = new Value();
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v->value = AutoType();
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return v;
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}
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auto Value::MakeFunctionType(const Value* param, const Value* ret)
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-> const Value* {
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auto* v = new Value();
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v->value = FunctionType({.param = param, .ret = ret});
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return v;
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}
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auto Value::MakePointerType(const Value* type) -> const Value* {
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auto* v = new Value();
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v->value = PointerType({.type = type});
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return v;
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}
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auto Value::MakeStructType(std::string name, VarValues fields,
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VarValues methods) -> const Value* {
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auto* v = new Value();
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v->value = StructType({.name = std::move(name),
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.fields = std::move(fields),
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.methods = std::move(methods)});
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return v;
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}
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auto Value::MakeUnitTypeVal() -> const Value* {
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auto* v = new Value();
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v->value = TupleValue({.elements = {}});
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return v;
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}
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auto Value::MakeChoiceType(std::string name, VarValues alts) -> const Value* {
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auto* v = new Value();
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v->value =
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ChoiceType({.name = std::move(name), .alternatives = std::move(alts)});
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return v;
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}
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auto PrintValue(const Value* val, std::ostream& out) -> void {
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switch (val->tag()) {
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case ValKind::AlternativeConstructorValue: {
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out << val->GetAlternativeConstructorValue().choice_name << "."
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<< val->GetAlternativeConstructorValue().alt_name;
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break;
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}
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case ValKind::BindingPlaceholderValue: {
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PrintValue(val->GetBindingPlaceholderValue().type, out);
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out << ": " << val->GetBindingPlaceholderValue().name;
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break;
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}
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case ValKind::AlternativeValue: {
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out << "alt " << val->GetAlternativeValue().choice_name << "."
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<< val->GetAlternativeValue().alt_name << " ";
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state->heap.PrintAddress(val->GetAlternativeValue().argument, out);
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break;
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}
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case ValKind::StructValue: {
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out << val->GetStructValue().type->GetStructType().name;
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PrintValue(val->GetStructValue().inits, out);
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break;
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}
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case ValKind::TupleValue: {
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out << "(";
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bool add_commas = false;
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for (const TupleElement& element : val->GetTupleValue().elements) {
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if (add_commas) {
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out << ", ";
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} else {
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add_commas = true;
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}
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out << element.name << " = ";
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state->heap.PrintAddress(element.address, out);
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}
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out << ")";
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break;
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}
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case ValKind::IntValue:
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out << val->GetIntValue();
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break;
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case ValKind::BoolValue:
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out << std::boolalpha << val->GetBoolValue();
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break;
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case ValKind::FunctionValue:
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out << "fun<" << val->GetFunctionValue().name << ">";
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break;
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case ValKind::PointerValue:
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out << "ptr<" << val->GetPointerValue() << ">";
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break;
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case ValKind::BoolType:
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out << "Bool";
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break;
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case ValKind::IntType:
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out << "Int";
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break;
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case ValKind::TypeType:
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out << "Type";
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break;
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case ValKind::AutoType:
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out << "auto";
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break;
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case ValKind::ContinuationType:
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out << "Continuation";
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break;
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case ValKind::PointerType:
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PrintValue(val->GetPointerType().type, out);
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out << "*";
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break;
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case ValKind::FunctionType:
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out << "fn ";
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PrintValue(val->GetFunctionType().param, out);
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out << " -> ";
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PrintValue(val->GetFunctionType().ret, out);
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break;
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case ValKind::StructType:
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out << "struct " << val->GetStructType().name;
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break;
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case ValKind::ChoiceType:
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out << "choice " << val->GetChoiceType().name;
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break;
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case ValKind::ContinuationValue:
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out << "continuation[[";
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for (Frame* frame : val->GetContinuationValue().stack) {
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PrintFrame(frame, out);
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out << " :: ";
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}
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out << "]]";
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break;
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}
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}
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auto TypeEqual(const Value* t1, const Value* t2) -> bool {
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if (t1->tag() != t2->tag()) {
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return false;
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}
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switch (t1->tag()) {
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case ValKind::PointerType:
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return TypeEqual(t1->GetPointerType().type, t2->GetPointerType().type);
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case ValKind::FunctionType:
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return TypeEqual(t1->GetFunctionType().param,
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t2->GetFunctionType().param) &&
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TypeEqual(t1->GetFunctionType().ret, t2->GetFunctionType().ret);
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case ValKind::StructType:
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return t1->GetStructType().name == t2->GetStructType().name;
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case ValKind::ChoiceType:
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return t1->GetChoiceType().name == t2->GetChoiceType().name;
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case ValKind::TupleValue: {
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if (t1->GetTupleValue().elements.size() !=
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t2->GetTupleValue().elements.size()) {
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return false;
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}
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for (size_t i = 0; i < t1->GetTupleValue().elements.size(); ++i) {
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if (t1->GetTupleValue().elements[i].name !=
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t2->GetTupleValue().elements[i].name) {
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return false;
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}
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if (!TypeEqual(
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state->heap.Read(t1->GetTupleValue().elements[i].address, 0),
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state->heap.Read(t2->GetTupleValue().elements[i].address, 0))) {
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return false;
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}
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}
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return true;
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}
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case ValKind::IntType:
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case ValKind::BoolType:
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case ValKind::ContinuationType:
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case ValKind::TypeType:
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return true;
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default:
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std::cerr << "TypeEqual used to compare non-type values" << std::endl;
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PrintValue(t1, std::cerr);
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std::cerr << std::endl;
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PrintValue(t2, std::cerr);
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exit(-1);
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}
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}
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// Returns true if all the fields of the two tuples contain equal values
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// and returns false otherwise.
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static auto FieldsValueEqual(const std::vector<TupleElement>& ts1,
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const std::vector<TupleElement>& ts2, int line_num)
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-> bool {
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if (ts1.size() != ts2.size()) {
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return false;
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}
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for (const TupleElement& element : ts1) {
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auto iter = std::find_if(
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ts2.begin(), ts2.end(),
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[&](const TupleElement& e2) { return e2.name == element.name; });
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if (iter == ts2.end()) {
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return false;
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}
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if (!ValueEqual(state->heap.Read(element.address, line_num),
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state->heap.Read(iter->address, line_num), line_num)) {
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return false;
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}
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}
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return true;
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}
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// Returns true if the two values are equal and returns false otherwise.
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//
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// This function implements the `==` operator of Carbon.
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auto ValueEqual(const Value* v1, const Value* v2, int line_num) -> bool {
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if (v1->tag() != v2->tag()) {
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return false;
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}
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switch (v1->tag()) {
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case ValKind::IntValue:
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return v1->GetIntValue() == v2->GetIntValue();
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case ValKind::BoolValue:
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return v1->GetBoolValue() == v2->GetBoolValue();
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case ValKind::PointerValue:
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return v1->GetPointerValue() == v2->GetPointerValue();
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case ValKind::FunctionValue:
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return v1->GetFunctionValue().body == v2->GetFunctionValue().body;
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case ValKind::TupleValue:
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return FieldsValueEqual(v1->GetTupleValue().elements,
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v2->GetTupleValue().elements, line_num);
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default:
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case ValKind::IntType:
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case ValKind::BoolType:
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case ValKind::TypeType:
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case ValKind::FunctionType:
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case ValKind::PointerType:
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case ValKind::AutoType:
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case ValKind::StructType:
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case ValKind::ChoiceType:
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case ValKind::ContinuationType:
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return TypeEqual(v1, v2);
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case ValKind::StructValue:
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case ValKind::AlternativeValue:
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case ValKind::BindingPlaceholderValue:
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case ValKind::AlternativeConstructorValue:
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case ValKind::ContinuationValue:
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std::cerr << "ValueEqual does not support this kind of value."
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<< std::endl;
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exit(-1);
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}
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}
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auto ToInteger(const Value* v) -> int {
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switch (v->tag()) {
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case ValKind::IntValue:
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return v->GetIntValue();
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default:
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std::cerr << "expected an integer, not ";
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PrintValue(v, std::cerr);
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exit(-1);
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}
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}
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} // namespace Carbon
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