chromium/third_party/dawn/src/tint/lang/core/ir/transform/common/referenced_module_vars.h

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#ifndef SRC_TINT_LANG_CORE_IR_TRANSFORM_COMMON_REFERENCED_MODULE_VARS_H_
#define SRC_TINT_LANG_CORE_IR_TRANSFORM_COMMON_REFERENCED_MODULE_VARS_H_

#include <functional>

#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/var.h"
#include "src/tint/utils/containers/hashmap.h"
#include "src/tint/utils/containers/unique_vector.h"

// Forward declarations.
namespace tint::core::ir {
class Block;
class Function;
}  // namespace tint::core::ir

namespace tint::core::ir {

/// ReferencedModuleVars is a helper to determine the set of module-scope variables that are
/// transitively referenced by functions in a module.
/// References are determined lazily and cached for future requests.
///
/// Note: changes to the module can invalidate the cached data. This is intended to be created by
/// a transform that need this information, and discarded when that transform completes. Tracking
/// this information inside the IR module would add overhead any time an instruction is added or
/// removed from the module. Since only a few transforms need this information, we expect it to be
/// more efficient to generate it as and when needed instead.
class ReferencedModuleVars { … };

}  // namespace tint::core::ir

#endif  // SRC_TINT_LANG_CORE_IR_TRANSFORM_COMMON_REFERENCED_MODULE_VARS_H_