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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/.
*/
#ifndef INCLUDED_COMPILERPLUGINS_CLANG_COMPAT_HXX
#define INCLUDED_COMPILERPLUGINS_CLANG_COMPAT_HXX
#include <cstddef>
#include <utility>
#include "clang/AST/Decl.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/StringRef.h"
#include "config_clang.h"
// Compatibility wrapper to abstract over (trivial) changes in the Clang API:
namespace compat {
inline llvm::StringRef take_front(llvm::StringRef ref, std::size_t N = 1) {
#if CLANG_VERSION >= 40000
return ref.take_front(N);
#else
auto const size = ref.size();
return N >= size ? ref : ref.drop_back(size - N);
#endif
}
#if CLANG_VERSION >= 30900
inline clang::ArrayRef<clang::ParmVarDecl *> parameters(
clang::FunctionDecl const & decl)
{
return decl.parameters();
}
#else
inline clang::FunctionDecl::param_const_range parameters(
clang::FunctionDecl const & decl)
{
return decl.params();
}
#endif
inline std::pair<clang::SourceLocation, clang::SourceLocation> getImmediateExpansionRange(
clang::SourceManager const & SM, clang::SourceLocation Loc)
{
#if CLANG_VERSION >= 70000
auto const csr = SM.getImmediateExpansionRange(Loc);
if (csr.isCharRange()) { /*TODO*/ }
return {csr.getBegin(), csr.getEnd()};
#else
return SM.getImmediateExpansionRange(Loc);
#endif
}
inline bool isPointWithin(
clang::SourceManager const & SM, clang::SourceLocation Location, clang::SourceLocation Start,
clang::SourceLocation End)
{
#if CLANG_VERSION >= 60000
return SM.isPointWithin(Location, Start, End);
#else
return
Location == Start || Location == End
|| (SM.isBeforeInTranslationUnit(Start, Location)
&& SM.isBeforeInTranslationUnit(Location, End));
#endif
}
inline bool isMacroArgExpansion(
clang::CompilerInstance& compiler, clang::SourceLocation location,
clang::SourceLocation * startLocation)
{
#if CLANG_VERSION >= 30900
return compiler.getSourceManager().isMacroArgExpansion(
location, startLocation);
#else
bool b = compiler.getSourceManager().isMacroArgExpansion(location);
if (b) {
*startLocation = compiler.getSourceManager()
.getSLocEntry(compiler.getSourceManager().getFileID(location))
.getExpansion().getExpansionLocStart();
}
return b;
#endif
}
inline llvm::StringRef getImmediateMacroNameForDiagnostics(
clang::SourceLocation Loc, clang::SourceManager const & SM,
clang::LangOptions const &LangOpts)
{
#if CLANG_VERSION >= 30900
return clang::Lexer::getImmediateMacroNameForDiagnostics(Loc, SM, LangOpts);
#else
using namespace clang;
// Verbatim copy from Clang's lib/Lex/Lexer.cpp:
assert(Loc.isMacroID() && "Only reasonable to call this on macros");
// Walk past macro argument expansion.
while (SM.isMacroArgExpansion(Loc))
Loc = SM.getImmediateExpansionRange(Loc).first;
// If the macro's spelling has no FileID, then it's actually a token paste
// or stringization (or similar) and not a macro at all.
if (!SM.getFileEntryForID(SM.getFileID(SM.getSpellingLoc(Loc))))
return StringRef();
// Find the spelling location of the start of the non-argument expansion
// range. This is where the macro name was spelled in order to begin
// expanding this macro.
Loc = SM.getSpellingLoc(SM.getImmediateExpansionRange(Loc).first);
// Dig out the buffer where the macro name was spelled and the extents of
// the name so that we can render it into the expansion note.
std::pair<FileID, unsigned> ExpansionInfo = SM.getDecomposedLoc(Loc);
unsigned MacroTokenLength = Lexer::MeasureTokenLength(Loc, SM, LangOpts);
StringRef ExpansionBuffer = SM.getBufferData(ExpansionInfo.first);
return ExpansionBuffer.substr(ExpansionInfo.second, MacroTokenLength);
#endif
}
// Work around <http://reviews.llvm.org/D22128>:
//
// SfxErrorHandler::GetClassString (svtools/source/misc/ehdl.cxx):
//
// ErrorResource_Impl aEr(aId, (sal_uInt16)lClassId);
// if(aEr)
// {
// rStr = static_cast<ResString>(aEr).GetString();
// }
//
// expr->dump():
// CXXStaticCastExpr 0x2b74e8e657b8 'class ResString' static_cast<class ResString> <ConstructorConversion>
// `-CXXBindTemporaryExpr 0x2b74e8e65798 'class ResString' (CXXTemporary 0x2b74e8e65790)
// `-CXXConstructExpr 0x2b74e8e65758 'class ResString' 'void (class ResString &&) noexcept(false)' elidable
// `-MaterializeTemporaryExpr 0x2b74e8e65740 'class ResString' xvalue
// `-CXXBindTemporaryExpr 0x2b74e8e65720 'class ResString' (CXXTemporary 0x2b74e8e65718)
// `-ImplicitCastExpr 0x2b74e8e65700 'class ResString' <UserDefinedConversion>
// `-CXXMemberCallExpr 0x2b74e8e656d8 'class ResString'
// `-MemberExpr 0x2b74e8e656a0 '<bound member function type>' .operator ResString 0x2b74e8dc1f00
// `-DeclRefExpr 0x2b74e8e65648 'struct ErrorResource_Impl' lvalue Var 0x2b74e8e653b0 'aEr' 'struct ErrorResource_Impl'
// expr->getSubExprAsWritten()->dump():
// MaterializeTemporaryExpr 0x2b74e8e65740 'class ResString' xvalue
// `-CXXBindTemporaryExpr 0x2b74e8e65720 'class ResString' (CXXTemporary 0x2b74e8e65718)
// `-ImplicitCastExpr 0x2b74e8e65700 'class ResString' <UserDefinedConversion>
// `-CXXMemberCallExpr 0x2b74e8e656d8 'class ResString'
// `-MemberExpr 0x2b74e8e656a0 '<bound member function type>' .operator ResString 0x2b74e8dc1f00
// `-DeclRefExpr 0x2b74e8e65648 'struct ErrorResource_Impl' lvalue Var 0x2b74e8e653b0 'aEr' 'struct ErrorResource_Impl'
//
// 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->GetTemporaryExpr();
// 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)->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));
}
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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