[clang] nonblocking/nonallocating attributes: 2nd pass caller/callee analysis (PR #99656)

[Erich Keane via cfe-commits]

================
@@ -0,0 +1,1571 @@
+//=== SemaFunctionEffects.cpp - Sema handling of function effects ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements Sema handling of function effects.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/AST/Stmt.h"
+#include "clang/AST/Type.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Sema/SemaInternal.h"
+
+#define DEBUG_TYPE "effectanalysis"
+
+using namespace clang;
+
+namespace {
+
+enum class ViolationID : uint8_t {
+  None = 0, // Sentinel for an empty Violation.
+  // These first few map to a %select{} in a diagnostic.
----------------
erichkeane wrote:

Instead of 'first few' can you clarify "first 6" or whatever?  And also mention the diagnostic/diagnostics?  I'd hate to have someone come along and add something here in the wrong place and get surprising/difficult to debug behavior.

https://github.com/llvm/llvm-project/pull/99656