================
@@ -0,0 +1,728 @@
+#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/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 <vector>
+
+namespace clang {
+namespace {
+
+struct Point {
+ const clang::CFGBlock *Block;
+ /// Index into Block->Elements().
+ unsigned ElementIndex;
+
+ Point(const clang::CFGBlock *B = nullptr, unsigned Idx = 0)
+ : Block(B), ElementIndex(Idx) {}
+
+ bool operator==(const Point &Other) const {
+ return Block == Other.Block && ElementIndex == Other.ElementIndex;
+ }
+};
+
+/// Represents the storage location being borrowed, e.g., a specific stack
+/// variable.
+/// TODO: Handle member accesseslike `s.y`.
+struct Path {
+ const clang::ValueDecl *D;
+
+ enum class Kind : uint8_t {
+ StackVariable,
+ Heap, // TODO: Handle.
+ Field, // TODO: Handle.
+ ArrayElement, // TODO: Handle.
+ TemporaryObject, // TODO: Handle.
+ StaticOrGlobal, // TODO: Handle.
+ };
+
+ Kind PathKind;
+
+ Path(const clang::ValueDecl *D, Kind K) : D(D), PathKind(K) {}
+};
+
+using LoanID = uint32_t;
+using OriginID = uint32_t;
+
+/// Information about a single borrow, or "Loan". A loan is created when a
+/// reference or pointer is taken.
+struct LoanInfo {
+ /// TODO: Represent opaque loans.
+ /// TODO: Represent nullptr: loans to no path. Accessing it UB! Currently it
+ /// is represented as empty LoanSet
+ LoanID ID;
+ Path SourcePath;
+ SourceLocation IssueLoc;
+
+ LoanInfo(LoanID id, Path path, SourceLocation loc)
+ : ID(id), SourcePath(path), IssueLoc(loc) {}
+};
+
+enum class OriginKind : uint8_t { Variable, ExpressionResult };
----------------
ymand wrote:
Since a variable (reference) is an expression, this is bit surprising. Is the
`Variable` case referring to the variable _declaration_? If so, maybe make that
expression (like Declaration vs Expression instead)?
https://github.com/llvm/llvm-project/pull/142313
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