1 files changed, 130 insertions, 0 deletions
diff --git a/compilerplugins/clang/compat.hxx b/compilerplugins/clang/compat.hxx
new file mode 100644
index 000000000..350263da6
--- /dev/null
+++ b/compilerplugins/clang/compat.hxx
@@ -0,0 +1,130 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <string>
+#include <utility>
+
+#include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/Specifiers.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/FileSystem.h"
+
+#include "config_clang.h"
+
+// Compatibility wrapper to abstract over (trivial) changes in the Clang API:
+namespace compat {
+
+inline std::string toString(llvm::APSInt const & i, unsigned radix) {
+#if CLANG_VERSION >= 130000
+    return llvm::toString(i, radix);
+#else
+    return i.toString(radix);
+#endif
+}
+
+inline std::pair<clang::SourceLocation, clang::SourceLocation> getImmediateExpansionRange(
+    clang::SourceManager const & SM, clang::SourceLocation Loc)
+{
+    auto const csr = SM.getImmediateExpansionRange(Loc);
+    if (csr.isCharRange()) { /*TODO*/ }
+    return {csr.getBegin(), csr.getEnd()};
+}
+
+/// Utility method
+inline clang::Expr const * IgnoreParenImplicit(clang::Expr const * expr) {
+    return expr->IgnoreImplicit()->IgnoreParens()->IgnoreImplicit();
+}
+
+#if CLANG_VERSION >= 130000
+constexpr clang::ExprValueKind VK_PRValue = clang::VK_PRValue;
+#else
+constexpr clang::ExprValueKind VK_PRValue = clang::VK_RValue;
+#endif
+
+inline bool EvaluateAsInt(clang::Expr const * expr, llvm::APSInt& intRes, const clang::ASTContext& ctx) {
+    clang::Expr::EvalResult res;
+    bool b = expr->EvaluateAsInt(res, ctx);
+    if (b && res.Val.isInt())
+        intRes = res.Val.getInt();
+    return b;
+}
+
+// Work around CastExpr::getSubExprAsWritten firing
+//
+//   include/llvm/Support/Casting.h:269: typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*)
+//   [with X = clang::CXXConstructExpr; Y = clang::Expr;
+//   typename llvm::cast_retty<X, Y*>::ret_type = clang::CXXConstructExpr*]: Assertion
+//   `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed.
+//
+// for CastExprs involving ConstantExpr (introduced with
+// <https://github.com/llvm/llvm-project/commit/7c44da279e399d302a685c500e7f802f8adf9762> "Create
+// ConstantExpr class" towards LLVM 8) like
+//
+//   CXXFunctionalCastExpr 0xc01c4e8 'class rtl::OStringLiteral<9>':'class rtl::OStringLiteral<9>' functional cast to OStringLiteral <ConstructorConversion>
+//   `-ConstantExpr 0xc01c380 'class rtl::OStringLiteral<9>':'class rtl::OStringLiteral<9>'
+//     |-value: Struct
+//     | |-fields: Int 1073741824, Int 8
+//     | `-field: Array size=9
+//     |   |-elements: Int 46, Int 111, Int 115, Int 108
+//     |   |-elements: Int 45, Int 116, Int 109, Int 112
+//     |   `-element: Int 0
+//     `-CXXConstructExpr 0xc01c350 'class rtl::OStringLiteral<9>':'class rtl::OStringLiteral<9>' 'void (const char (&)[9])'
+//       `-StringLiteral 0xc019ad8 'const char [9]' lvalue ".osl-tmp"
+//
+// Copies code from Clang's lib/AST/Expr.cpp:
+namespace detail {
+  inline clang::Expr *skipImplicitTemporary(clang::Expr *expr) {
+    // Skip through reference binding to temporary.
+    if (clang::MaterializeTemporaryExpr *Materialize
+                                  = clang::dyn_cast<clang::MaterializeTemporaryExpr>(expr))
+      expr = Materialize->getSubExpr();
+
+    // Skip any temporary bindings; they're implicit.
+    if (clang::CXXBindTemporaryExpr *Binder = clang::dyn_cast<clang::CXXBindTemporaryExpr>(expr))
+      expr = Binder->getSubExpr();
+
+    return expr;
+  }
+}
+inline clang::Expr *getSubExprAsWritten(clang::CastExpr *This) {
+  clang::Expr *SubExpr = nullptr;
+  clang::CastExpr *E = This;
+  do {
+    SubExpr = detail::skipImplicitTemporary(E->getSubExpr());
+
+    // Conversions by constructor and conversion functions have a
+    // subexpression describing the call; strip it off.
+    if (E->getCastKind() == clang::CK_ConstructorConversion)
+      SubExpr =
+        detail::skipImplicitTemporary(clang::cast<clang::CXXConstructExpr>(SubExpr->IgnoreImplicit())->getArg(0));
+    else if (E->getCastKind() == clang::CK_UserDefinedConversion) {
+      assert((clang::isa<clang::CXXMemberCallExpr>(SubExpr) ||
+              clang::isa<clang::BlockExpr>(SubExpr)) &&
+             "Unexpected SubExpr for CK_UserDefinedConversion.");
+      if (clang::isa<clang::CXXMemberCallExpr>(SubExpr))
+        SubExpr = clang::cast<clang::CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument();
+    }
+
+    // If the subexpression we're left with is an implicit cast, look
+    // through that, too.
+  } while ((E = clang::dyn_cast<clang::ImplicitCastExpr>(SubExpr)));
+
+  return SubExpr;
+}
+inline const clang::Expr *getSubExprAsWritten(const clang::CastExpr *This) {
+  return getSubExprAsWritten(const_cast<clang::CastExpr *>(This));
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */