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https://github.com/carbon-language/carbon-lang.git
synced 2026-10-01 22:02:45 +01:00
Geoff Romer
0df9e8666c
This lets us statically distinguish between code that works with arbitrary `Address`es and code that can only work with pointers to separately-allocated storage, and so we no longer need to worry about the latter code crashing at run-time (as `Heap::Deallocate` did) or silently doing the wrong thing (as `Heap::PrintAddress` did) if it's given the wrong kind of `Address`.
62 lines
2.0 KiB
C++
62 lines
2.0 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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#ifndef EXECUTABLE_SEMANTICS_INTERPRETER_HEAP_H_
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#define EXECUTABLE_SEMANTICS_INTERPRETER_HEAP_H_
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#include <vector>
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#include "common/ostream.h"
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#include "executable_semantics/interpreter/address.h"
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#include "executable_semantics/interpreter/value.h"
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#include "llvm/Support/Compiler.h"
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namespace Carbon {
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// A Heap represents the abstract machine's dynamically allocated memory.
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class Heap {
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public:
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// Constructs an empty Heap.
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explicit Heap(Nonnull<Arena*> arena) : arena_(arena){};
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Heap(const Heap&) = delete;
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auto operator=(const Heap&) -> Heap& = delete;
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// Returns the value at the given address in the heap after
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// checking that it is alive.
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auto Read(const Address& a, SourceLocation source_loc)
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-> Nonnull<const Value*>;
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// Writes the given value at the address in the heap after
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// checking that the address is alive.
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void Write(const Address& a, Nonnull<const Value*> v,
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SourceLocation source_loc);
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// Put the given value on the heap and mark it as alive.
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auto AllocateValue(Nonnull<const Value*> v) -> AllocationId;
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// Marks this allocation, and all of its sub-objects, as dead.
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void Deallocate(AllocationId allocation);
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// Print the value at the given allocation to the stream `out`.
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void PrintAllocation(AllocationId allocation, llvm::raw_ostream& out) const;
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// Print all the values on the heap to the stream `out`.
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void Print(llvm::raw_ostream& out) const;
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LLVM_DUMP_METHOD void Dump() const { Print(llvm::errs()); }
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private:
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// Signal an error if the allocation is no longer alive.
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void CheckAlive(AllocationId allocation, SourceLocation source_loc);
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Nonnull<Arena*> arena_;
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std::vector<Nonnull<const Value*>> values_;
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std::vector<bool> alive_;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_INTERPRETER_HEAP_H_
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