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// Copyright 2021 The Dawn & Tint Authors
//
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#ifndef SRC_TINT_UTILS_ID_GENERATION_ID_H_
#define SRC_TINT_UTILS_ID_GENERATION_ID_H_
#include <stdint.h>
#include <utility>
#include "src/tint/utils/ice/ice.h"
#include "src/tint/utils/text/string_stream.h"
#include "src/tint/utils/traits/traits.h"
namespace tint {
/// If 1 then checks are enabled that AST nodes are not leaked from one generation
/// to another.
/// TODO(bclayton): We'll want to disable this in production builds. For now we
/// always check.
#define TINT_CHECK_FOR_CROSS_GENERATION_LEAKS 1
/// A GenerationID is a unique identifier of a generation.
/// GenerationID can be used to ensure that objects referenced by the generation are
/// owned exclusively by that generation and have accidentally not leaked from
/// another generation.
class GenerationID {
public:
/// Constructor
GenerationID();
/// @returns a new. globally unique GenerationID
static GenerationID New();
/// Equality operator
/// @param rhs the other GenerationID
/// @returns true if the GenerationIDs are equal
bool operator==(const GenerationID& rhs) const { return val == rhs.val; }
/// Inequality operator
/// @param rhs the other GenerationID
/// @returns true if the GenerationIDs are not equal
bool operator!=(const GenerationID& rhs) const { return val != rhs.val; }
/// @returns the numerical identifier value
uint32_t Value() const { return val; }
/// @returns true if this GenerationID is valid
operator bool() const { return val != 0; }
private:
explicit GenerationID(uint32_t);
uint32_t val = 0;
};
/// A simple pass-through function for GenerationID. Intended to be overloaded for
/// other types.
/// @param id a GenerationID
/// @returns id. Simple pass-through function
inline GenerationID GenerationIDOf(GenerationID id) {
return id;
}
/// Writes the GenerationID to the stream.
/// @param out the stream to write to
/// @param id the generation identifier to write
/// @returns out so calls can be chained
template <typename STREAM, typename = traits::EnableIfIsOStream<STREAM>>
auto& operator<<(STREAM& out, GenerationID id) {
out << "Generation<" << id.Value() << ">";
return out;
}
namespace detail {
/// AssertGenerationIDsEqual is called by TINT_ASSERT_GENERATION_IDS_EQUAL() and
/// TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID() to assert that the GenerationIDs
/// `a` and `b` are equal.
void AssertGenerationIDsEqual(GenerationID a,
GenerationID b,
bool if_valid,
const char* msg,
const char* file,
size_t line);
} // namespace detail
/// TINT_ASSERT_GENERATION_IDS_EQUAL(A, B) is a macro that asserts that the
/// generation identifiers for A and B are equal.
///
/// TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(A, B) is a macro that asserts
/// that the generation identifiers for A and B are equal, if both A and B have
/// valid generation identifiers.
#if TINT_CHECK_FOR_CROSS_GENERATION_LEAKS
#define TINT_ASSERT_GENERATION_IDS_EQUAL(a, b) \
tint::detail::AssertGenerationIDsEqual(GenerationIDOf(a), GenerationIDOf(b), false, \
"TINT_ASSERT_GENERATION_IDS_EQUAL(" #a ", " #b ")", \
__FILE__, __LINE__)
#define TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(a, b) \
tint::detail::AssertGenerationIDsEqual( \
GenerationIDOf(a), GenerationIDOf(b), true, \
"TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(" #a ", " #b ")", __FILE__, __LINE__)
#else
#define TINT_ASSERT_GENERATION_IDS_EQUAL(a, b) \
do { \
} while (false)
#define TINT_ASSERT_GENERATION_IDS_EQUAL_IF_VALID(a, b) \
do { \
} while (false)
#endif
} // namespace tint
#endif // SRC_TINT_UTILS_ID_GENERATION_ID_H_