https://github.com/noamcohen97 updated 
https://github.com/llvm/llvm-project/pull/179281

>From 0e04dbb6beffe10361d230875de00d3576022cc4 Mon Sep 17 00:00:00 2001
From: Noam Cohen <[email protected]>
Date: Mon, 2 Feb 2026 18:40:39 +0200
Subject: [PATCH 1/5] [clang] ast-dump: dump `AvailabilityAttr` fields to JSON

---
 clang/include/clang/AST/JSONNodeDumper.h |   1 +
 clang/lib/AST/JSONNodeDumper.cpp         |  19 +++++
 clang/test/AST/ast-dump-attr-json.cpp    | 104 +++++++++++++++++++++++
 3 files changed, 124 insertions(+)

diff --git a/clang/include/clang/AST/JSONNodeDumper.h 
b/clang/include/clang/AST/JSONNodeDumper.h
index b786147728058..69dbdbbdb3ecd 100644
--- a/clang/include/clang/AST/JSONNodeDumper.h
+++ b/clang/include/clang/AST/JSONNodeDumper.h
@@ -219,6 +219,7 @@ class JSONNodeDumper
   void VisitSectionAttr(const SectionAttr *SA);
   void VisitVisibilityAttr(const VisibilityAttr *VA);
   void VisitTLSModelAttr(const TLSModelAttr *TA);
+  void VisitAvailabilityAttr(const AvailabilityAttr *AA);
 
   void VisitTypedefType(const TypedefType *TT);
   void VisitUsingType(const UsingType *TT);
diff --git a/clang/lib/AST/JSONNodeDumper.cpp b/clang/lib/AST/JSONNodeDumper.cpp
index 715e1e0989422..47fee7a3624f8 100644
--- a/clang/lib/AST/JSONNodeDumper.cpp
+++ b/clang/lib/AST/JSONNodeDumper.cpp
@@ -596,6 +596,25 @@ void JSONNodeDumper::VisitTLSModelAttr(const TLSModelAttr 
*TA) {
   JOS.attribute("tls_model", TA->getModel());
 }
 
+void JSONNodeDumper::VisitAvailabilityAttr(const AvailabilityAttr *AA) {
+  if (const IdentifierInfo *Platform = AA->getPlatform())
+    JOS.attribute("platform", Platform->getName());
+  if (!AA->getIntroduced().empty())
+    JOS.attribute("introduced", AA->getIntroduced().getAsString());
+  if (!AA->getDeprecated().empty())
+    JOS.attribute("deprecated", AA->getDeprecated().getAsString());
+  if (!AA->getObsoleted().empty())
+    JOS.attribute("obsoleted", AA->getObsoleted().getAsString());
+  attributeOnlyIfTrue("unavailable", AA->getUnavailable());
+  if (!AA->getMessage().empty())
+    JOS.attribute("message", AA->getMessage());
+  if (!AA->getReplacement().empty())
+    JOS.attribute("replacement", AA->getReplacement());
+  attributeOnlyIfTrue("strict", AA->getStrict());
+  if (const IdentifierInfo *Env = AA->getEnvironment())
+    JOS.attribute("environment", Env->getName());
+}
+
 void JSONNodeDumper::VisitTypedefType(const TypedefType *TT) {
   JOS.attribute("decl", createBareDeclRef(TT->getDecl()));
   if (!TT->typeMatchesDecl())
diff --git a/clang/test/AST/ast-dump-attr-json.cpp 
b/clang/test/AST/ast-dump-attr-json.cpp
index 883e584bfedf0..f9825aee29ecd 100644
--- a/clang/test/AST/ast-dump-attr-json.cpp
+++ b/clang/test/AST/ast-dump-attr-json.cpp
@@ -21,6 +21,9 @@ __attribute__ ((visibility ("hidden"))) int visibility_var;
 
 __thread __attribute__ ((tls_model ("local-exec"))) int tls_model_var;
 
+__attribute__((availability(macos, strict, introduced=10.15, deprecated=12.0, 
obsoleted=13.0, replacement="new_func"))) int availability_var_all;
+__attribute__((availability(macos, unavailable, message="use new API"))) int 
availability_var_unavailable;
+
 // NOTE: CHECK lines have been autogenerated by gen_ast_dump_json_test.py
 // using --filters=VarDecl
 
@@ -529,3 +532,104 @@ __thread __attribute__ ((tls_model ("local-exec"))) int 
tls_model_var;
 // CHECK-NEXT:   }
 // CHECK-NEXT:  ]
 // CHECK-NEXT: }
+
+
+// CHECK-NOT: {{^}}Dumping
+// CHECK:  "kind": "VarDecl",
+// CHECK-NEXT:  "loc": {
+// CHECK-NEXT:   "offset": 888,
+// CHECK-NEXT:   "line": 24,
+// CHECK-NEXT:   "col": 125,
+// CHECK-NEXT:   "tokLen": 20
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "range": {
+// CHECK-NEXT:   "begin": {
+// CHECK-NEXT:    "offset": 764,
+// CHECK-NEXT:    "col": 1,
+// CHECK-NEXT:    "tokLen": 13
+// CHECK-NEXT:   },
+// CHECK-NEXT:   "end": {
+// CHECK-NEXT:    "offset": 888,
+// CHECK-NEXT:    "col": 125,
+// CHECK-NEXT:    "tokLen": 20
+// CHECK-NEXT:   }
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "name": "availability_var_all",
+// CHECK-NEXT:  "mangledName": "availability_var_all",
+// CHECK-NEXT:  "type": {
+// CHECK-NEXT:   "qualType": "int"
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "inner": [
+// CHECK-NEXT:   {
+// CHECK-NEXT:    "id": "0x{{.*}}",
+// CHECK-NEXT:    "kind": "AvailabilityAttr",
+// CHECK-NEXT:    "range": {
+// CHECK-NEXT:     "begin": {
+// CHECK-NEXT:      "offset": 779,
+// CHECK-NEXT:      "col": 16,
+// CHECK-NEXT:      "tokLen": 12
+// CHECK-NEXT:     },
+// CHECK-NEXT:     "end": {
+// CHECK-NEXT:      "offset": 880,
+// CHECK-NEXT:      "col": 117,
+// CHECK-NEXT:      "tokLen": 1
+// CHECK-NEXT:     }
+// CHECK-NEXT:    },
+// CHECK-NEXT:    "platform": "macos",
+// CHECK-NEXT:    "introduced": "10.15",
+// CHECK-NEXT:    "deprecated": "12.0",
+// CHECK-NEXT:    "obsoleted": "13.0",
+// CHECK-NEXT:    "replacement": "new_func",
+// CHECK-NEXT:    "strict": true
+// CHECK-NEXT:   }
+// CHECK-NEXT:  ]
+// CHECK-NEXT: }
+
+
+// CHECK-NOT: {{^}}Dumping
+// CHECK:  "kind": "VarDecl",
+// CHECK-NEXT:  "loc": {
+// CHECK-NEXT:   "offset": 987,
+// CHECK-NEXT:   "line": 25,
+// CHECK-NEXT:   "col": 78,
+// CHECK-NEXT:   "tokLen": 28
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "range": {
+// CHECK-NEXT:   "begin": {
+// CHECK-NEXT:    "offset": 910,
+// CHECK-NEXT:    "col": 1,
+// CHECK-NEXT:    "tokLen": 13
+// CHECK-NEXT:   },
+// CHECK-NEXT:   "end": {
+// CHECK-NEXT:    "offset": 987,
+// CHECK-NEXT:    "col": 78,
+// CHECK-NEXT:    "tokLen": 28
+// CHECK-NEXT:   }
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "name": "availability_var_unavailable",
+// CHECK-NEXT:  "mangledName": "availability_var_unavailable",
+// CHECK-NEXT:  "type": {
+// CHECK-NEXT:   "qualType": "int"
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "inner": [
+// CHECK-NEXT:   {
+// CHECK-NEXT:    "id": "0x{{.*}}",
+// CHECK-NEXT:    "kind": "AvailabilityAttr",
+// CHECK-NEXT:    "range": {
+// CHECK-NEXT:     "begin": {
+// CHECK-NEXT:      "offset": 925,
+// CHECK-NEXT:      "col": 16,
+// CHECK-NEXT:      "tokLen": 12
+// CHECK-NEXT:     },
+// CHECK-NEXT:     "end": {
+// CHECK-NEXT:      "offset": 979,
+// CHECK-NEXT:      "col": 70,
+// CHECK-NEXT:      "tokLen": 1
+// CHECK-NEXT:     }
+// CHECK-NEXT:    },
+// CHECK-NEXT:    "platform": "macos",
+// CHECK-NEXT:    "unavailable": true,
+// CHECK-NEXT:    "message": "use new API"
+// CHECK-NEXT:   }
+// CHECK-NEXT:  ]
+// CHECK-NEXT: }

>From 654f9b6825fd5c679efb088784d04ba9527065fb Mon Sep 17 00:00:00 2001
From: Noam Cohen <[email protected]>
Date: Fri, 6 Feb 2026 07:50:11 +0200
Subject: [PATCH 2/5] correct order

---
 clang/lib/AST/JSONNodeDumper.cpp      | 2 +-
 clang/test/AST/ast-dump-attr-json.cpp | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/clang/lib/AST/JSONNodeDumper.cpp b/clang/lib/AST/JSONNodeDumper.cpp
index 47fee7a3624f8..beec308df512b 100644
--- a/clang/lib/AST/JSONNodeDumper.cpp
+++ b/clang/lib/AST/JSONNodeDumper.cpp
@@ -608,9 +608,9 @@ void JSONNodeDumper::VisitAvailabilityAttr(const 
AvailabilityAttr *AA) {
   attributeOnlyIfTrue("unavailable", AA->getUnavailable());
   if (!AA->getMessage().empty())
     JOS.attribute("message", AA->getMessage());
+  attributeOnlyIfTrue("strict", AA->getStrict());
   if (!AA->getReplacement().empty())
     JOS.attribute("replacement", AA->getReplacement());
-  attributeOnlyIfTrue("strict", AA->getStrict());
   if (const IdentifierInfo *Env = AA->getEnvironment())
     JOS.attribute("environment", Env->getName());
 }
diff --git a/clang/test/AST/ast-dump-attr-json.cpp 
b/clang/test/AST/ast-dump-attr-json.cpp
index f9825aee29ecd..9d36deaa9d038 100644
--- a/clang/test/AST/ast-dump-attr-json.cpp
+++ b/clang/test/AST/ast-dump-attr-json.cpp
@@ -21,7 +21,7 @@ __attribute__ ((visibility ("hidden"))) int visibility_var;
 
 __thread __attribute__ ((tls_model ("local-exec"))) int tls_model_var;
 
-__attribute__((availability(macos, strict, introduced=10.15, deprecated=12.0, 
obsoleted=13.0, replacement="new_func"))) int availability_var_all;
+__attribute__((availability(macos, introduced=10.15, deprecated=12.0, 
obsoleted=13.0, strict, replacement="new_func"))) int availability_var_all;
 __attribute__((availability(macos, unavailable, message="use new API"))) int 
availability_var_unavailable;
 
 // NOTE: CHECK lines have been autogenerated by gen_ast_dump_json_test.py
@@ -579,8 +579,8 @@ __attribute__((availability(macos, unavailable, 
message="use new API"))) int ava
 // CHECK-NEXT:    "introduced": "10.15",
 // CHECK-NEXT:    "deprecated": "12.0",
 // CHECK-NEXT:    "obsoleted": "13.0",
-// CHECK-NEXT:    "replacement": "new_func",
-// CHECK-NEXT:    "strict": true
+// CHECK-NEXT:    "strict": true,
+// CHECK-NEXT:    "replacement": "new_func"
 // CHECK-NEXT:   }
 // CHECK-NEXT:  ]
 // CHECK-NEXT: }

>From 55cd3cb4e5befc15648178261d61eb370e095994 Mon Sep 17 00:00:00 2001
From: Noam Cohen <[email protected]>
Date: Fri, 6 Feb 2026 07:53:39 +0200
Subject: [PATCH 3/5] add `priority`

---
 clang/lib/AST/JSONNodeDumper.cpp      |  2 +
 clang/test/AST/ast-dump-attr-json.cpp | 54 +++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/clang/lib/AST/JSONNodeDumper.cpp b/clang/lib/AST/JSONNodeDumper.cpp
index beec308df512b..3138f95e6a83b 100644
--- a/clang/lib/AST/JSONNodeDumper.cpp
+++ b/clang/lib/AST/JSONNodeDumper.cpp
@@ -611,6 +611,8 @@ void JSONNodeDumper::VisitAvailabilityAttr(const 
AvailabilityAttr *AA) {
   attributeOnlyIfTrue("strict", AA->getStrict());
   if (!AA->getReplacement().empty())
     JOS.attribute("replacement", AA->getReplacement());
+  if (AA->getPriority() != 0)
+    JOS.attribute("priority", AA->getPriority());
   if (const IdentifierInfo *Env = AA->getEnvironment())
     JOS.attribute("environment", Env->getName());
 }
diff --git a/clang/test/AST/ast-dump-attr-json.cpp 
b/clang/test/AST/ast-dump-attr-json.cpp
index 9d36deaa9d038..454d9665dcfe2 100644
--- a/clang/test/AST/ast-dump-attr-json.cpp
+++ b/clang/test/AST/ast-dump-attr-json.cpp
@@ -24,6 +24,10 @@ __thread __attribute__ ((tls_model ("local-exec"))) int 
tls_model_var;
 __attribute__((availability(macos, introduced=10.15, deprecated=12.0, 
obsoleted=13.0, strict, replacement="new_func"))) int availability_var_all;
 __attribute__((availability(macos, unavailable, message="use new API"))) int 
availability_var_unavailable;
 
+#pragma clang attribute push(__attribute__((availability(macos, 
introduced=11.0))), apply_to=variable)
+int availability_var_pragma;
+#pragma clang attribute pop
+
 // NOTE: CHECK lines have been autogenerated by gen_ast_dump_json_test.py
 // using --filters=VarDecl
 
@@ -633,3 +637,53 @@ __attribute__((availability(macos, unavailable, 
message="use new API"))) int ava
 // CHECK-NEXT:   }
 // CHECK-NEXT:  ]
 // CHECK-NEXT: }
+
+
+// CHECK-NOT: {{^}}Dumping
+// CHECK:  "kind": "VarDecl",
+// CHECK-NEXT:  "loc": {
+// CHECK-NEXT:   "offset": 1125,
+// CHECK-NEXT:   "line": 28,
+// CHECK-NEXT:   "col": 5,
+// CHECK-NEXT:   "tokLen": 23
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "range": {
+// CHECK-NEXT:   "begin": {
+// CHECK-NEXT:    "offset": 1121,
+// CHECK-NEXT:    "col": 1,
+// CHECK-NEXT:    "tokLen": 3
+// CHECK-NEXT:   },
+// CHECK-NEXT:   "end": {
+// CHECK-NEXT:    "offset": 1125,
+// CHECK-NEXT:    "col": 5,
+// CHECK-NEXT:    "tokLen": 23
+// CHECK-NEXT:   }
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "name": "availability_var_pragma",
+// CHECK-NEXT:  "mangledName": "availability_var_pragma",
+// CHECK-NEXT:  "type": {
+// CHECK-NEXT:   "qualType": "int"
+// CHECK-NEXT:  },
+// CHECK-NEXT:  "inner": [
+// CHECK-NEXT:   {
+// CHECK-NEXT:    "id": "0x{{.*}}",
+// CHECK-NEXT:    "kind": "AvailabilityAttr",
+// CHECK-NEXT:    "range": {
+// CHECK-NEXT:     "begin": {
+// CHECK-NEXT:      "offset": 1062,
+// CHECK-NEXT:      "line": 27,
+// CHECK-NEXT:      "col": 45,
+// CHECK-NEXT:      "tokLen": 12
+// CHECK-NEXT:     },
+// CHECK-NEXT:     "end": {
+// CHECK-NEXT:      "offset": 1097,
+// CHECK-NEXT:      "col": 80,
+// CHECK-NEXT:      "tokLen": 1
+// CHECK-NEXT:     }
+// CHECK-NEXT:    },
+// CHECK-NEXT:    "platform": "macos",
+// CHECK-NEXT:    "introduced": "11.0",
+// CHECK-NEXT:    "priority": 1
+// CHECK-NEXT:   }
+// CHECK-NEXT:  ]
+// CHECK-NEXT: }

>From 0f969a335c80744a682511d30d120333e932a269 Mon Sep 17 00:00:00 2001
From: Noam Cohen <[email protected]>
Date: Fri, 6 Feb 2026 07:59:44 +0200
Subject: [PATCH 4/5] add release note

---
 clang/docs/ReleaseNotes.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 1b4c9ae3003b1..7c6ecd0103a44 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -49,6 +49,11 @@ ABI Changes in This Version
 AST Dumping Potentially Breaking Changes
 ----------------------------------------
 
+- The JSON AST dump now includes all fields from ``AvailabilityAttr``: 
``platform``,
+  ``introduced``, ``deprecated``, ``obsoleted``, ``unavailable``, ``message``,
+  ``strict``, ``replacement``, ``priority``, and ``environment``. Previously, 
these
+  fields were missing from the JSON output.
+
 Clang Frontend Potentially Breaking Changes
 -------------------------------------------
 

>From 0435ccf002e1bfd140ef86bc167f144f9ed40ef5 Mon Sep 17 00:00:00 2001
From: Noam Cohen <[email protected]>
Date: Fri, 6 Feb 2026 08:09:14 +0200
Subject: [PATCH 5/5] add `environment` test

---
 .../AST/HLSL/ast-dump-availability-attr.hlsl     | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 clang/test/AST/HLSL/ast-dump-availability-attr.hlsl

diff --git a/clang/test/AST/HLSL/ast-dump-availability-attr.hlsl 
b/clang/test/AST/HLSL/ast-dump-availability-attr.hlsl
new file mode 100644
index 0000000000000..2addc84722099
--- /dev/null
+++ b/clang/test/AST/HLSL/ast-dump-availability-attr.hlsl
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -ast-dump=json %s | 
FileCheck %s
+
+// Test AvailabilityAttr fields in JSON AST dump
+
+__attribute__((availability(shadermodel, introduced=6.0, deprecated=6.3, 
obsoleted=6.5, replacement="new_func", environment=compute)))
+void availability_all(void);
+
+// CHECK: "kind": "FunctionDecl",
+// CHECK: "name": "availability_all",
+// CHECK: "kind": "AvailabilityAttr",
+// CHECK: "platform": "shadermodel",
+// CHECK: "introduced": "6.0",
+// CHECK: "deprecated": "6.3",
+// CHECK: "obsoleted": "6.5",
+// CHECK: "replacement": "new_func",
+// CHECK: "environment": "compute"

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