[llvm] Add clang::lifetimebound annotation to ArrayRef constructors. (PR #113547)

[Haojian Wu via llvm-commits]

https://github.com/hokein updated https://github.com/llvm/llvm-project/pull/113547

>From 8d10e497d98b3618b0b09baa081f56be3c5d3c46 Mon Sep 17 00:00:00 2001
From: Haojian Wu <hokein.wu at gmail.com>
Date: Thu, 24 Oct 2024 12:12:37 +0200
Subject: [PATCH 1/2] Add clang::lifetimebound annotation to ArrayRef
 constructors.

---
 llvm/include/llvm/ADT/ArrayRef.h     | 5 +++--
 llvm/include/llvm/Support/Compiler.h | 6 ++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/ADT/ArrayRef.h b/llvm/include/llvm/ADT/ArrayRef.h
index bf6b55923b84ba..c9615e7b61a936 100644
--- a/llvm/include/llvm/ADT/ArrayRef.h
+++ b/llvm/include/llvm/ADT/ArrayRef.h
@@ -70,7 +70,7 @@ namespace llvm {
     /*implicit*/ ArrayRef(std::nullopt_t) {}
 
     /// Construct an ArrayRef from a single element.
-    /*implicit*/ ArrayRef(const T &OneElt)
+    /*implicit*/ ArrayRef(const T &OneElt LLVM_LIFETIME_BOUND)
       : Data(&OneElt), Length(1) {}
 
     /// Construct an ArrayRef from a pointer and length.
@@ -103,7 +103,8 @@ namespace llvm {
 
     /// Construct an ArrayRef from a C array.
     template <size_t N>
-    /*implicit*/ constexpr ArrayRef(const T (&Arr)[N]) : Data(Arr), Length(N) {}
+    /*implicit*/ constexpr ArrayRef(const T (&Arr LLVM_LIFETIME_BOUND)[N])
+        : Data(Arr), Length(N) {}
 
     /// Construct an ArrayRef from a std::initializer_list.
 #if LLVM_GNUC_PREREQ(9, 0, 0)
diff --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
index 591e7647795bb2..3b03c2851a4214 100644
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -413,6 +413,12 @@
 #define LLVM_GSL_POINTER
 #endif
 
+#if LLVM_HAS_CPP_ATTRIBUTE(clang::lifetimebound)
+#define LLVM_LIFETIME_BOUND [[clang::lifetimebound]]
+#else
+#define LLVM_LLVM_LIFETIME_BOUND
+#endif
+
 #if LLVM_HAS_CPP_ATTRIBUTE(nodiscard) >= 201907L
 #define LLVM_CTOR_NODISCARD [[nodiscard]]
 #else

>From 0ac2069e5cb3e8d331bc8381cfed3c75f9dc890b Mon Sep 17 00:00:00 2001
From: Haojian Wu <hokein.wu at gmail.com>
Date: Thu, 24 Oct 2024 14:22:23 +0200
Subject: [PATCH 2/2] Annotate more constructors.

---
 llvm/include/llvm/ADT/ArrayRef.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/llvm/include/llvm/ADT/ArrayRef.h b/llvm/include/llvm/ADT/ArrayRef.h
index c9615e7b61a936..1139fd81cbd07f 100644
--- a/llvm/include/llvm/ADT/ArrayRef.h
+++ b/llvm/include/llvm/ADT/ArrayRef.h
@@ -71,14 +71,15 @@ namespace llvm {
 
     /// Construct an ArrayRef from a single element.
     /*implicit*/ ArrayRef(const T &OneElt LLVM_LIFETIME_BOUND)
-      : Data(&OneElt), Length(1) {}
+        : Data(&OneElt), Length(1) {}
 
     /// Construct an ArrayRef from a pointer and length.
-    constexpr /*implicit*/ ArrayRef(const T *data, size_t length)
+    constexpr /*implicit*/ ArrayRef(const T *data LLVM_LIFETIME_BOUND,
+                                    size_t length)
         : Data(data), Length(length) {}
 
     /// Construct an ArrayRef from a range.
-    constexpr ArrayRef(const T *begin, const T *end)
+    constexpr ArrayRef(const T *begin LLVM_LIFETIME_BOUND, const T *end)
         : Data(begin), Length(end - begin) {
       assert(begin <= end);
     }
@@ -114,7 +115,8 @@ namespace llvm {
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Winit-list-lifetime"
 #endif
-    constexpr /*implicit*/ ArrayRef(std::initializer_list<T> Vec)
+    constexpr /*implicit*/ ArrayRef(
+        std::initializer_list<T> Vec LLVM_LIFETIME_BOUND)
         : Data(Vec.begin() == Vec.end() ? (T *)nullptr : Vec.begin()),
           Length(Vec.size()) {}
 #if LLVM_GNUC_PREREQ(9, 0, 0)