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/* -*- 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: */
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