mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 16:40:11 +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
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "executable_semantics/interpreter/value.h"
|
|
|
|
#include <algorithm>
|
|
#include <iostream>
|
|
|
|
#include "common/check.h"
|
|
#include "executable_semantics/interpreter/interpreter.h"
|
|
|
|
namespace Carbon {
|
|
|
|
int Value::GetIntValue() const {
|
|
CHECK(tag == ValKind::IntValue);
|
|
return u.integer;
|
|
}
|
|
|
|
bool Value::GetBoolValue() const {
|
|
CHECK(tag == ValKind::BoolValue);
|
|
return u.boolean;
|
|
}
|
|
|
|
FunctionValue Value::GetFunctionValue() const {
|
|
CHECK(tag == ValKind::FunctionValue);
|
|
return u.fun;
|
|
}
|
|
|
|
StructValue Value::GetStructValue() const {
|
|
CHECK(tag == ValKind::StructValue);
|
|
return u.struct_val;
|
|
}
|
|
|
|
AlternativeConstructorValue Value::GetAlternativeConstructorValue() const {
|
|
CHECK(tag == ValKind::AlternativeConstructorValue);
|
|
return u.alt_cons;
|
|
}
|
|
|
|
AlternativeValue Value::GetAlternativeValue() const {
|
|
CHECK(tag == ValKind::AlternativeValue);
|
|
return u.alt;
|
|
}
|
|
|
|
TupleValue Value::GetTupleValue() const {
|
|
CHECK(tag == ValKind::TupleValue);
|
|
return u.tuple;
|
|
}
|
|
|
|
Address Value::GetPointerValue() const {
|
|
CHECK(tag == ValKind::PointerValue);
|
|
return u.ptr;
|
|
}
|
|
|
|
std::string* Value::GetVariableType() const {
|
|
CHECK(tag == ValKind::VarTV);
|
|
return u.var_type;
|
|
}
|
|
|
|
PatternVariableValue Value::GetPatternVariableValue() const {
|
|
CHECK(tag == ValKind::PatternVariableValue);
|
|
return u.var_pat;
|
|
}
|
|
|
|
FunctionType Value::GetFunctionType() const {
|
|
CHECK(tag == ValKind::FunctionType);
|
|
return u.fun_type;
|
|
}
|
|
|
|
PointerType Value::GetPointerType() const {
|
|
CHECK(tag == ValKind::PointerType);
|
|
return u.ptr_type;
|
|
}
|
|
|
|
StructType Value::GetStructType() const {
|
|
CHECK(tag == ValKind::StructType);
|
|
return u.struct_type;
|
|
}
|
|
|
|
ChoiceType Value::GetChoiceType() const {
|
|
CHECK(tag == ValKind::ChoiceType);
|
|
return u.choice_type;
|
|
}
|
|
|
|
ContinuationValue Value::GetContinuationValue() const {
|
|
CHECK(tag == ValKind::ContinuationValue);
|
|
return u.continuation;
|
|
}
|
|
|
|
auto FindInVarValues(const std::string& field, VarValues* inits)
|
|
-> const Value* {
|
|
for (auto& i : *inits) {
|
|
if (i.first == field) {
|
|
return i.second;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
auto FieldsEqual(VarValues* ts1, VarValues* ts2) -> bool {
|
|
if (ts1->size() == ts2->size()) {
|
|
for (auto& iter1 : *ts1) {
|
|
auto t2 = FindInVarValues(iter1.first, ts2);
|
|
if (t2 == nullptr) {
|
|
return false;
|
|
}
|
|
if (!TypeEqual(iter1.second, t2)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
auto FindTupleField(const std::string& name, const Value* tuple)
|
|
-> std::optional<Address> {
|
|
CHECK(tuple->tag == ValKind::TupleValue);
|
|
for (const TupleElement& element : *tuple->GetTupleValue().elements) {
|
|
if (element.name == name) {
|
|
return element.address;
|
|
}
|
|
}
|
|
return std::nullopt;
|
|
}
|
|
|
|
auto Value::MakeIntValue(int i) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::IntValue;
|
|
v->u.integer = i;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeBoolValue(bool b) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::BoolValue;
|
|
v->u.boolean = b;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeFunctionValue(std::string name, const Value* param,
|
|
const Statement* body) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::FunctionValue;
|
|
v->u.fun.name = new std::string(std::move(name));
|
|
v->u.fun.param = param;
|
|
v->u.fun.body = body;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakePointerValue(Address addr) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::PointerValue;
|
|
v->u.ptr = addr;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeStructValue(const Value* type, const Value* inits)
|
|
-> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::StructValue;
|
|
v->u.struct_val.type = type;
|
|
v->u.struct_val.inits = inits;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeTupleValue(std::vector<TupleElement>* elements)
|
|
-> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::TupleValue;
|
|
v->u.tuple.elements = elements;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeAlternativeValue(std::string alt_name, std::string choice_name,
|
|
Address argument) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::AlternativeValue;
|
|
v->u.alt.alt_name = new std::string(std::move(alt_name));
|
|
v->u.alt.choice_name = new std::string(std::move(choice_name));
|
|
v->u.alt.argument = argument;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeAlternativeConstructorValue(std::string alt_name,
|
|
std::string choice_name)
|
|
-> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::AlternativeConstructorValue;
|
|
v->u.alt.alt_name = new std::string(std::move(alt_name));
|
|
v->u.alt.choice_name = new std::string(std::move(choice_name));
|
|
return v;
|
|
}
|
|
|
|
// Return a first-class continuation represented a fragment
|
|
// of the stack.
|
|
auto Value::MakeContinuationValue(std::vector<Frame*> stack) -> Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::ContinuationValue;
|
|
v->u.continuation.stack = new std::vector<Frame*>(stack);
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakePatternVariableValue(std::string name, const Value* type)
|
|
-> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::PatternVariableValue;
|
|
v->u.var_pat.name = new std::string(std::move(name));
|
|
v->u.var_pat.type = type;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeVarTypeVal(std::string name) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::VarTV;
|
|
v->u.var_type = new std::string(std::move(name));
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeIntType() -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::IntType;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeBoolType() -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::BoolType;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeTypeType() -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::TypeType;
|
|
return v;
|
|
}
|
|
|
|
// Return a Continuation type.
|
|
auto Value::MakeContinuationType() -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::ContinuationType;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeAutoType() -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::AutoType;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeFunctionType(const Value* param, const Value* ret)
|
|
-> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::FunctionType;
|
|
v->u.fun_type.param = param;
|
|
v->u.fun_type.ret = ret;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakePointerType(const Value* type) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::PointerType;
|
|
v->u.ptr_type.type = type;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeStructType(std::string name, VarValues* fields,
|
|
VarValues* methods) -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::StructType;
|
|
v->u.struct_type.name = new std::string(std::move(name));
|
|
v->u.struct_type.fields = fields;
|
|
v->u.struct_type.methods = methods;
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeUnitTypeVal() -> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::TupleValue;
|
|
v->u.tuple.elements = new std::vector<TupleElement>();
|
|
return v;
|
|
}
|
|
|
|
auto Value::MakeChoiceType(
|
|
std::string name, std::list<std::pair<std::string, const Value*>>* alts)
|
|
-> const Value* {
|
|
auto* v = new Value();
|
|
v->tag = ValKind::ChoiceType;
|
|
// Transitional leak: when we get rid of all pointers, this will disappear.
|
|
v->u.choice_type.name = new std::string(name);
|
|
v->u.choice_type.alternatives = alts;
|
|
return v;
|
|
}
|
|
|
|
auto PrintValue(const Value* val, std::ostream& out) -> void {
|
|
switch (val->tag) {
|
|
case ValKind::AlternativeConstructorValue: {
|
|
out << *val->GetAlternativeConstructorValue().choice_name << "."
|
|
<< *val->GetAlternativeConstructorValue().alt_name;
|
|
break;
|
|
}
|
|
case ValKind::PatternVariableValue: {
|
|
PrintValue(val->GetPatternVariableValue().type, out);
|
|
out << ": " << *val->GetPatternVariableValue().name;
|
|
break;
|
|
}
|
|
case ValKind::AlternativeValue: {
|
|
out << "alt " << *val->GetAlternativeValue().choice_name << "."
|
|
<< *val->GetAlternativeValue().alt_name << " ";
|
|
state->heap.PrintAddress(val->GetAlternativeValue().argument, out);
|
|
break;
|
|
}
|
|
case ValKind::StructValue: {
|
|
out << *val->GetStructValue().type->GetStructType().name;
|
|
PrintValue(val->GetStructValue().inits, out);
|
|
break;
|
|
}
|
|
case ValKind::TupleValue: {
|
|
out << "(";
|
|
bool add_commas = false;
|
|
for (const TupleElement& element : *val->GetTupleValue().elements) {
|
|
if (add_commas) {
|
|
out << ", ";
|
|
} else {
|
|
add_commas = true;
|
|
}
|
|
|
|
out << element.name << " = ";
|
|
state->heap.PrintAddress(element.address, out);
|
|
}
|
|
out << ")";
|
|
break;
|
|
}
|
|
case ValKind::IntValue:
|
|
out << val->GetIntValue();
|
|
break;
|
|
case ValKind::BoolValue:
|
|
out << std::boolalpha << val->GetBoolValue();
|
|
break;
|
|
case ValKind::FunctionValue:
|
|
out << "fun<" << *val->GetFunctionValue().name << ">";
|
|
break;
|
|
case ValKind::PointerValue:
|
|
out << "ptr<" << val->GetPointerValue() << ">";
|
|
break;
|
|
case ValKind::BoolType:
|
|
out << "Bool";
|
|
break;
|
|
case ValKind::IntType:
|
|
out << "Int";
|
|
break;
|
|
case ValKind::TypeType:
|
|
out << "Type";
|
|
break;
|
|
case ValKind::AutoType:
|
|
out << "auto";
|
|
break;
|
|
case ValKind::ContinuationType:
|
|
out << "Continuation";
|
|
break;
|
|
case ValKind::PointerType:
|
|
PrintValue(val->GetPointerType().type, out);
|
|
out << "*";
|
|
break;
|
|
case ValKind::FunctionType:
|
|
out << "fn ";
|
|
PrintValue(val->GetFunctionType().param, out);
|
|
out << " -> ";
|
|
PrintValue(val->GetFunctionType().ret, out);
|
|
break;
|
|
case ValKind::VarTV:
|
|
out << *val->GetVariableType();
|
|
break;
|
|
case ValKind::StructType:
|
|
out << "struct " << *val->GetStructType().name;
|
|
break;
|
|
case ValKind::ChoiceType:
|
|
out << "choice " << *val->GetChoiceType().name;
|
|
break;
|
|
case ValKind::ContinuationValue:
|
|
out << "continuation[[";
|
|
for (Frame* frame : *val->GetContinuationValue().stack) {
|
|
PrintFrame(frame, out);
|
|
out << " :: ";
|
|
}
|
|
out << "]]";
|
|
break;
|
|
}
|
|
}
|
|
|
|
auto TypeEqual(const Value* t1, const Value* t2) -> bool {
|
|
if (t1->tag != t2->tag) {
|
|
return false;
|
|
}
|
|
switch (t1->tag) {
|
|
case ValKind::VarTV:
|
|
return *t1->GetVariableType() == *t2->GetVariableType();
|
|
case ValKind::PointerType:
|
|
return TypeEqual(t1->GetPointerType().type, t2->GetPointerType().type);
|
|
case ValKind::FunctionType:
|
|
return TypeEqual(t1->GetFunctionType().param,
|
|
t2->GetFunctionType().param) &&
|
|
TypeEqual(t1->GetFunctionType().ret, t2->GetFunctionType().ret);
|
|
case ValKind::StructType:
|
|
return *t1->GetStructType().name == *t2->GetStructType().name;
|
|
case ValKind::ChoiceType:
|
|
return *t1->GetChoiceType().name == *t2->GetChoiceType().name;
|
|
case ValKind::TupleValue: {
|
|
if (t1->GetTupleValue().elements->size() !=
|
|
t2->GetTupleValue().elements->size()) {
|
|
return false;
|
|
}
|
|
for (size_t i = 0; i < t1->GetTupleValue().elements->size(); ++i) {
|
|
if ((*t1->GetTupleValue().elements)[i].name !=
|
|
(*t2->GetTupleValue().elements)[i].name) {
|
|
return false;
|
|
}
|
|
if (!TypeEqual(
|
|
state->heap.Read((*t1->GetTupleValue().elements)[i].address, 0),
|
|
state->heap.Read((*t2->GetTupleValue().elements)[i].address,
|
|
0))) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
case ValKind::IntType:
|
|
case ValKind::BoolType:
|
|
case ValKind::ContinuationType:
|
|
case ValKind::TypeType:
|
|
return true;
|
|
default:
|
|
std::cerr << "TypeEqual used to compare non-type values" << std::endl;
|
|
PrintValue(t1, std::cerr);
|
|
std::cerr << std::endl;
|
|
PrintValue(t2, std::cerr);
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
// Returns true if all the fields of the two tuples contain equal values
|
|
// and returns false otherwise.
|
|
static auto FieldsValueEqual(std::vector<TupleElement>* ts1,
|
|
std::vector<TupleElement>* ts2, int line_num)
|
|
-> bool {
|
|
if (ts1->size() != ts2->size()) {
|
|
return false;
|
|
}
|
|
for (const TupleElement& element : *ts1) {
|
|
auto iter = std::find_if(
|
|
ts2->begin(), ts2->end(),
|
|
[&](const TupleElement& e2) { return e2.name == element.name; });
|
|
if (iter == ts2->end()) {
|
|
return false;
|
|
}
|
|
if (!ValueEqual(state->heap.Read(element.address, line_num),
|
|
state->heap.Read(iter->address, line_num), line_num)) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Returns true if the two values are equal and returns false otherwise.
|
|
//
|
|
// This function implements the `==` operator of Carbon.
|
|
auto ValueEqual(const Value* v1, const Value* v2, int line_num) -> bool {
|
|
if (v1->tag != v2->tag) {
|
|
return false;
|
|
}
|
|
switch (v1->tag) {
|
|
case ValKind::IntValue:
|
|
return v1->GetIntValue() == v2->GetIntValue();
|
|
case ValKind::BoolValue:
|
|
return v1->GetBoolValue() == v2->GetBoolValue();
|
|
case ValKind::PointerValue:
|
|
return v1->GetPointerValue() == v2->GetPointerValue();
|
|
case ValKind::FunctionValue:
|
|
return v1->GetFunctionValue().body == v2->GetFunctionValue().body;
|
|
case ValKind::TupleValue:
|
|
return FieldsValueEqual(v1->GetTupleValue().elements,
|
|
v2->GetTupleValue().elements, line_num);
|
|
default:
|
|
case ValKind::VarTV:
|
|
case ValKind::IntType:
|
|
case ValKind::BoolType:
|
|
case ValKind::TypeType:
|
|
case ValKind::FunctionType:
|
|
case ValKind::PointerType:
|
|
case ValKind::AutoType:
|
|
case ValKind::StructType:
|
|
case ValKind::ChoiceType:
|
|
case ValKind::ContinuationType:
|
|
return TypeEqual(v1, v2);
|
|
case ValKind::StructValue:
|
|
case ValKind::AlternativeValue:
|
|
case ValKind::PatternVariableValue:
|
|
case ValKind::AlternativeConstructorValue:
|
|
case ValKind::ContinuationValue:
|
|
std::cerr << "ValueEqual does not support this kind of value."
|
|
<< std::endl;
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
auto ToInteger(const Value* v) -> int {
|
|
switch (v->tag) {
|
|
case ValKind::IntValue:
|
|
return v->GetIntValue();
|
|
default:
|
|
std::cerr << "expected an integer, not ";
|
|
PrintValue(v, std::cerr);
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
} // namespace Carbon
|