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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Meow
d5124256a2
- Move Heap and Frame/Scope to their own headers. - Move some functions to more appropriate headers (e.g. CopyValue -> value.h). - Define a separate Bazel rule for each header/cpp pair. - Modify PrintValue to not print the frames of a ContinuationValue. This was necessary to break a dependency cycle between PrintValue, PrintFrame, and Action::Print. Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
67 lines
1.9 KiB
C++
67 lines
1.9 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/heap.h"
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namespace Carbon {
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auto Heap::AllocateValue(const Value* v) -> Address {
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// Putting the following two side effects together in this function
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// ensures that we don't do anything else in between, which is really bad!
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// Consider whether to include a copy of the input v in this function
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// or to leave it up to the caller.
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CHECK(v != nullptr);
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Address a(values_.size());
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values_.push_back(v);
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alive_.push_back(true);
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return a;
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}
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auto Heap::Read(const Address& a, int line_num) -> const Value* {
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this->CheckAlive(a, line_num);
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return values_[a.index]->GetField(a.field_path, line_num);
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}
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auto Heap::Write(const Address& a, const Value* v, int line_num) -> void {
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CHECK(v != nullptr);
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this->CheckAlive(a, line_num);
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values_[a.index] = values_[a.index]->SetField(a.field_path, v, line_num);
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}
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void Heap::CheckAlive(const Address& address, int line_num) {
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if (!alive_[address.index]) {
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std::cerr << line_num << ": undefined behavior: access to dead value ";
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PrintValue(values_[address.index], std::cerr);
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std::cerr << std::endl;
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exit(-1);
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}
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}
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void Heap::Deallocate(const Address& address) {
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CHECK(address.field_path.IsEmpty());
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if (alive_[address.index]) {
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alive_[address.index] = false;
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} else {
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std::cerr << "runtime error, deallocating an already dead 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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void Heap::PrintHeap(std::ostream& out) {
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for (size_t i = 0; i < values_.size(); ++i) {
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PrintAddress(Address(i), out);
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out << ", ";
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}
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}
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auto Heap::PrintAddress(const Address& a, std::ostream& out) -> void {
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if (!alive_[a.index]) {
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out << "!!";
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}
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PrintValue(values_[a.index], out);
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}
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} // namespace Carbon
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