mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Geoff Romer
a80ce2c566
- `Kind` enumerator names always match the corresponding factory function, accessor, and type names (if any). - All abbreviations in those names are expanded. - Those names always have a suffix to disambiguate expressions from values. `VarTV` is excluded from these changes because there's a pending PR to remove it.
519 lines
14 KiB
C++
519 lines
14 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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int Value::GetIntValue() const {
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CHECK(tag == ValKind::IntValue);
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return u.integer;
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}
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bool Value::GetBoolValue() const {
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CHECK(tag == ValKind::BoolValue);
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return u.boolean;
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}
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FunctionValue Value::GetFunctionValue() const {
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CHECK(tag == ValKind::FunctionValue);
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return u.fun;
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}
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StructValue Value::GetStructValue() const {
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CHECK(tag == ValKind::StructValue);
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return u.struct_val;
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}
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AlternativeConstructorValue Value::GetAlternativeConstructorValue() const {
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CHECK(tag == ValKind::AlternativeConstructorValue);
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return u.alt_cons;
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}
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AlternativeValue Value::GetAlternativeValue() const {
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CHECK(tag == ValKind::AlternativeValue);
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return u.alt;
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}
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TupleValue Value::GetTupleValue() const {
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CHECK(tag == ValKind::TupleValue);
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return u.tuple;
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}
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Address Value::GetPointerValue() const {
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CHECK(tag == ValKind::PointerValue);
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return u.ptr;
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}
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std::string* Value::GetVariableType() const {
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CHECK(tag == ValKind::VarTV);
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return u.var_type;
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}
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PatternVariableValue Value::GetPatternVariableValue() const {
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CHECK(tag == ValKind::PatternVariableValue);
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return u.var_pat;
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}
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FunctionType Value::GetFunctionType() const {
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CHECK(tag == ValKind::FunctionType);
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return u.fun_type;
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}
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PointerType Value::GetPointerType() const {
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CHECK(tag == ValKind::PointerType);
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return u.ptr_type;
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}
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StructType Value::GetStructType() const {
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CHECK(tag == ValKind::StructType);
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return u.struct_type;
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}
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ChoiceType Value::GetChoiceType() const {
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CHECK(tag == ValKind::ChoiceType);
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return u.choice_type;
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}
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ContinuationValue Value::GetContinuationValue() const {
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CHECK(tag == ValKind::ContinuationValue);
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return u.continuation;
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}
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auto FindInVarValues(const std::string& field, 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(VarValues* ts1, 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->tag = ValKind::IntValue;
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v->u.integer = 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->tag = ValKind::BoolValue;
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v->u.boolean = 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->tag = ValKind::FunctionValue;
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v->u.fun.name = new std::string(std::move(name));
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v->u.fun.param = param;
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v->u.fun.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->tag = ValKind::PointerValue;
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v->u.ptr = 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->tag = ValKind::StructValue;
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v->u.struct_val.type = type;
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v->u.struct_val.inits = inits;
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return v;
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}
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auto Value::MakeTupleValue(std::vector<TupleElement>* elements)
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-> const Value* {
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auto* v = new Value();
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v->tag = ValKind::TupleValue;
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v->u.tuple.elements = 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->tag = ValKind::AlternativeValue;
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v->u.alt.alt_name = new std::string(std::move(alt_name));
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v->u.alt.choice_name = new std::string(std::move(choice_name));
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v->u.alt.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->tag = ValKind::AlternativeConstructorValue;
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v->u.alt.alt_name = new std::string(std::move(alt_name));
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v->u.alt.choice_name = new std::string(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->tag = ValKind::ContinuationValue;
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v->u.continuation.stack = new std::vector<Frame*>(stack);
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return v;
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}
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auto Value::MakePatternVariableValue(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->tag = ValKind::PatternVariableValue;
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v->u.var_pat.name = new std::string(std::move(name));
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v->u.var_pat.type = type;
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return v;
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}
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auto Value::MakeVarTypeVal(std::string name) -> const Value* {
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auto* v = new Value();
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v->tag = ValKind::VarTV;
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v->u.var_type = new std::string(std::move(name));
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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->tag = ValKind::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->tag = ValKind::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->tag = ValKind::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->tag = ValKind::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->tag = ValKind::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->tag = ValKind::FunctionType;
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v->u.fun_type.param = param;
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v->u.fun_type.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->tag = ValKind::PointerType;
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v->u.ptr_type.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->tag = ValKind::StructType;
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v->u.struct_type.name = new std::string(std::move(name));
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v->u.struct_type.fields = fields;
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v->u.struct_type.methods = 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->tag = ValKind::TupleValue;
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v->u.tuple.elements = new std::vector<TupleElement>();
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return v;
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}
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auto Value::MakeChoiceType(
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std::string name, std::list<std::pair<std::string, const Value*>>* alts)
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-> const Value* {
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auto* v = new Value();
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v->tag = ValKind::ChoiceType;
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// Transitional leak: when we get rid of all pointers, this will disappear.
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v->u.choice_type.name = new std::string(name);
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v->u.choice_type.alternatives = 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::PatternVariableValue: {
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PrintValue(val->GetPatternVariableValue().type, out);
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out << ": " << *val->GetPatternVariableValue().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::VarTV:
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out << *val->GetVariableType();
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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::VarTV:
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return *t1->GetVariableType() == *t2->GetVariableType();
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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,
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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(std::vector<TupleElement>* ts1,
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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::VarTV:
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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::PatternVariableValue:
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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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