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Generate unique identifiers for Decl objects 

The generated identifier is stable across multiple runs,
and can be a great visualization or debugging aide.

Differential Revision: https://reviews.llvm.org/D52113

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342315 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
George Karpenkov 2018-09-15 02:03:58 +00:00
parent ab961c560a
commit a495c43386
2 changed files with 10 additions and 0 deletions
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3
include/clang/AST/DeclBase.h
View File

@ -1141,6 +1141,9 @@ public:
void dump(raw_ostream &Out, bool Deserialize = false) const;
/// \return Unique reproducible object identifier
int64_t getID() const;
/// Looks through the Decl's underlying type to extract a FunctionType
/// when possible. Will return null if the type underlying the Decl does not
/// have a FunctionType.

7
lib/AST/DeclBase.cpp
View File

@ -930,6 +930,13 @@ bool Decl::AccessDeclContextSanity() const {
static Decl::Kind getKind(const Decl *D) { return D->getKind(); }
static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); }
int64_t Decl::getID() const {
Optional<int64_t> Out = getASTContext().getAllocator().identifyObject(this);
assert(Out && "Wrong allocator used");
assert(*Out % alignof(Decl) == 0 && "Wrong alignment information");
return *Out / alignof(Decl);
}
const FunctionType *Decl::getFunctionType(bool BlocksToo) const {
QualType Ty;
if (const auto *D = dyn_cast<ValueDecl>(this))