================
@@ -0,0 +1,753 @@
+#include "clang/Analysis/Analyses/LifetimeSafety.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/StmtVisitor.h"
+#include "clang/AST/Type.h"
+#include "clang/Analysis/AnalysisDeclContext.h"
+#include "clang/Analysis/CFG.h"
+#include "clang/Analysis/FlowSensitive/DataflowWorklist.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/ImmutableMap.h"
+#include "llvm/ADT/ImmutableSet.h"
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/TimeProfiler.h"
+#include <cstdint>
+
+namespace clang {
+namespace {
+
+/// Represents the storage location being borrowed, e.g., a specific stack
+/// variable.
+struct AccessPath {
+ const clang::ValueDecl *D;
+
+ enum class Kind : uint8_t {
+ StackVariable,
+ Temporary, // TODO: Handle.
+ Field, // TODO: Handle like `s.y`.
+ Heap, // TODO: Handle.
+ ArrayElement, // TODO: Handle.
+ Static, // TODO: Handle.
+ };
+
+ Kind PathKind;
+
+ AccessPath(const clang::ValueDecl *D, Kind K) : D(D), PathKind(K) {}
+};
+
+/// A generic, type-safe wrapper for an ID, distinguished by its `Tag` type.
+/// Used for giving ID to loans and origins.
+template <typename Tag> struct ID {
+ uint32_t Value = 0;
+
+ bool operator==(const ID<Tag> &Other) const { return Value == Other.Value; }
+ bool operator!=(const ID<Tag> &Other) const { return !(*this == Other); }
+ bool operator<(const ID<Tag> &Other) const { return Value < Other.Value; }
+ ID<Tag> &operator++() {
+ ++Value;
+ return *this;
+ }
+ void Profile(llvm::FoldingSetNodeID &IDBuilder) const {
+ IDBuilder.AddInteger(Value);
+ }
+};
+
+template <typename Tag>
+inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, ID<Tag> ID) {
+ return OS << ID.Value;
+}
+
+struct LoanTag {};
+struct OriginTag {};
+
+using LoanID = ID<LoanTag>;
----------------
Xazax-hun wrote:
I think you could even do `using LoanID = ID<struct LoanTag>;`, so no separate
definition is required for these tags.
https://github.com/llvm/llvm-project/pull/142313
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