bab6df86ae
Summary:
Previously, we treated CXXUuidofExpr as quite a special case: it was the
only kind of expression that could be a canonical template argument, it
could be a constant lvalue base object, and so on. In addition, we
represented the UUID value as a string, whose source form we did not
preserve faithfully, and that we partially parsed in multiple different
places.
With this patch, we create an MSGuidDecl object to represent the
implicit object of type 'struct _GUID' created by a UuidAttr. Each
UuidAttr holds a pointer to its 'struct _GUID' and its original
(as-written) UUID string. A non-value-dependent CXXUuidofExpr behaves
like a DeclRefExpr denoting that MSGuidDecl object. We cache an APValue
representation of the GUID on the MSGuidDecl and use it from constant
evaluation where needed.
This allows removing a lot of the special-case logic to handle these
expressions. Unfortunately, many parts of Clang assume there are only
a couple of interesting kinds of ValueDecl, so the total amount of
special-case logic is not really reduced very much.
This fixes a few bugs and issues:
* PR38490: we now support reading from GUID objects returned from
__uuidof during constant evaluation.
* Our Itanium mangling for a non-instantiation-dependent template
argument involving __uuidof no longer depends on which CXXUuidofExpr
template argument we happened to see first.
* We now predeclare ::_GUID, and permit use of __uuidof without
any header inclusion, better matching MSVC's behavior. We do not
predefine ::__s_GUID, though; that seems like a step too far.
* Our IR representation for GUID constants now uses the correct IR type
wherever possible. We will still fall back to using the
{i32, i16, i16, [8 x i8]}
layout if a definition of struct _GUID is not available. This is not
ideal: in principle the two layouts could have different padding.
Reviewers: rnk, jdoerfert
Subscribers: arphaman, cfe-commits, aeubanks
Tags: #clang
Differential Revision: https://reviews.llvm.org/D78171
462 lines
13 KiB
C++
462 lines
13 KiB
C++
//===--- ASTCommon.cpp - Common stuff for ASTReader/ASTWriter----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines common functions that both ASTReader and ASTWriter use.
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//
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//===----------------------------------------------------------------------===//
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#include "ASTCommon.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/Basic/IdentifierTable.h"
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#include "clang/Serialization/ASTDeserializationListener.h"
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#include "llvm/Support/DJB.h"
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using namespace clang;
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// Give ASTDeserializationListener's VTable a home.
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ASTDeserializationListener::~ASTDeserializationListener() { }
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serialization::TypeIdx
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serialization::TypeIdxFromBuiltin(const BuiltinType *BT) {
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unsigned ID = 0;
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switch (BT->getKind()) {
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case BuiltinType::Void:
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ID = PREDEF_TYPE_VOID_ID;
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break;
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case BuiltinType::Bool:
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ID = PREDEF_TYPE_BOOL_ID;
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break;
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case BuiltinType::Char_U:
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ID = PREDEF_TYPE_CHAR_U_ID;
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break;
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case BuiltinType::UChar:
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ID = PREDEF_TYPE_UCHAR_ID;
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break;
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case BuiltinType::UShort:
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ID = PREDEF_TYPE_USHORT_ID;
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break;
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case BuiltinType::UInt:
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ID = PREDEF_TYPE_UINT_ID;
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break;
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case BuiltinType::ULong:
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ID = PREDEF_TYPE_ULONG_ID;
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break;
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case BuiltinType::ULongLong:
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ID = PREDEF_TYPE_ULONGLONG_ID;
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break;
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case BuiltinType::UInt128:
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ID = PREDEF_TYPE_UINT128_ID;
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break;
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case BuiltinType::Char_S:
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ID = PREDEF_TYPE_CHAR_S_ID;
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break;
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case BuiltinType::SChar:
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ID = PREDEF_TYPE_SCHAR_ID;
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break;
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case BuiltinType::WChar_S:
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case BuiltinType::WChar_U:
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ID = PREDEF_TYPE_WCHAR_ID;
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break;
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case BuiltinType::Short:
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ID = PREDEF_TYPE_SHORT_ID;
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break;
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case BuiltinType::Int:
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ID = PREDEF_TYPE_INT_ID;
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break;
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case BuiltinType::Long:
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ID = PREDEF_TYPE_LONG_ID;
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break;
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case BuiltinType::LongLong:
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ID = PREDEF_TYPE_LONGLONG_ID;
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break;
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case BuiltinType::Int128:
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ID = PREDEF_TYPE_INT128_ID;
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break;
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case BuiltinType::Half:
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ID = PREDEF_TYPE_HALF_ID;
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break;
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case BuiltinType::Float:
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ID = PREDEF_TYPE_FLOAT_ID;
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break;
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case BuiltinType::Double:
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ID = PREDEF_TYPE_DOUBLE_ID;
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break;
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case BuiltinType::LongDouble:
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ID = PREDEF_TYPE_LONGDOUBLE_ID;
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break;
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case BuiltinType::ShortAccum:
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ID = PREDEF_TYPE_SHORT_ACCUM_ID;
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break;
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case BuiltinType::Accum:
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ID = PREDEF_TYPE_ACCUM_ID;
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break;
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case BuiltinType::LongAccum:
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ID = PREDEF_TYPE_LONG_ACCUM_ID;
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break;
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case BuiltinType::UShortAccum:
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ID = PREDEF_TYPE_USHORT_ACCUM_ID;
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break;
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case BuiltinType::UAccum:
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ID = PREDEF_TYPE_UACCUM_ID;
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break;
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case BuiltinType::ULongAccum:
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ID = PREDEF_TYPE_ULONG_ACCUM_ID;
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break;
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case BuiltinType::ShortFract:
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ID = PREDEF_TYPE_SHORT_FRACT_ID;
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break;
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case BuiltinType::Fract:
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ID = PREDEF_TYPE_FRACT_ID;
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break;
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case BuiltinType::LongFract:
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ID = PREDEF_TYPE_LONG_FRACT_ID;
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break;
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case BuiltinType::UShortFract:
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ID = PREDEF_TYPE_USHORT_FRACT_ID;
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break;
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case BuiltinType::UFract:
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ID = PREDEF_TYPE_UFRACT_ID;
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break;
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case BuiltinType::ULongFract:
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ID = PREDEF_TYPE_ULONG_FRACT_ID;
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break;
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case BuiltinType::SatShortAccum:
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ID = PREDEF_TYPE_SAT_SHORT_ACCUM_ID;
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break;
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case BuiltinType::SatAccum:
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ID = PREDEF_TYPE_SAT_ACCUM_ID;
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break;
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case BuiltinType::SatLongAccum:
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ID = PREDEF_TYPE_SAT_LONG_ACCUM_ID;
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break;
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case BuiltinType::SatUShortAccum:
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ID = PREDEF_TYPE_SAT_USHORT_ACCUM_ID;
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break;
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case BuiltinType::SatUAccum:
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ID = PREDEF_TYPE_SAT_UACCUM_ID;
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break;
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case BuiltinType::SatULongAccum:
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ID = PREDEF_TYPE_SAT_ULONG_ACCUM_ID;
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break;
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case BuiltinType::SatShortFract:
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ID = PREDEF_TYPE_SAT_SHORT_FRACT_ID;
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break;
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case BuiltinType::SatFract:
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ID = PREDEF_TYPE_SAT_FRACT_ID;
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break;
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case BuiltinType::SatLongFract:
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ID = PREDEF_TYPE_SAT_LONG_FRACT_ID;
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break;
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case BuiltinType::SatUShortFract:
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ID = PREDEF_TYPE_SAT_USHORT_FRACT_ID;
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break;
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case BuiltinType::SatUFract:
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ID = PREDEF_TYPE_SAT_UFRACT_ID;
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break;
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case BuiltinType::SatULongFract:
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ID = PREDEF_TYPE_SAT_ULONG_FRACT_ID;
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break;
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case BuiltinType::Float16:
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ID = PREDEF_TYPE_FLOAT16_ID;
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break;
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case BuiltinType::Float128:
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ID = PREDEF_TYPE_FLOAT128_ID;
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break;
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case BuiltinType::NullPtr:
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ID = PREDEF_TYPE_NULLPTR_ID;
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break;
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case BuiltinType::Char8:
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ID = PREDEF_TYPE_CHAR8_ID;
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break;
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case BuiltinType::Char16:
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ID = PREDEF_TYPE_CHAR16_ID;
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break;
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case BuiltinType::Char32:
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ID = PREDEF_TYPE_CHAR32_ID;
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break;
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case BuiltinType::Overload:
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ID = PREDEF_TYPE_OVERLOAD_ID;
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break;
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case BuiltinType::BoundMember:
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ID = PREDEF_TYPE_BOUND_MEMBER;
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break;
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case BuiltinType::PseudoObject:
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ID = PREDEF_TYPE_PSEUDO_OBJECT;
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break;
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case BuiltinType::Dependent:
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ID = PREDEF_TYPE_DEPENDENT_ID;
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break;
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case BuiltinType::UnknownAny:
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ID = PREDEF_TYPE_UNKNOWN_ANY;
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break;
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case BuiltinType::ARCUnbridgedCast:
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ID = PREDEF_TYPE_ARC_UNBRIDGED_CAST;
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break;
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case BuiltinType::ObjCId:
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ID = PREDEF_TYPE_OBJC_ID;
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break;
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case BuiltinType::ObjCClass:
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ID = PREDEF_TYPE_OBJC_CLASS;
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break;
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case BuiltinType::ObjCSel:
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ID = PREDEF_TYPE_OBJC_SEL;
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break;
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#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
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case BuiltinType::Id: \
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ID = PREDEF_TYPE_##Id##_ID; \
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break;
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#include "clang/Basic/OpenCLImageTypes.def"
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#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
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case BuiltinType::Id: \
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ID = PREDEF_TYPE_##Id##_ID; \
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break;
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#include "clang/Basic/OpenCLExtensionTypes.def"
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case BuiltinType::OCLSampler:
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ID = PREDEF_TYPE_SAMPLER_ID;
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break;
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case BuiltinType::OCLEvent:
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ID = PREDEF_TYPE_EVENT_ID;
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break;
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case BuiltinType::OCLClkEvent:
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ID = PREDEF_TYPE_CLK_EVENT_ID;
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break;
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case BuiltinType::OCLQueue:
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ID = PREDEF_TYPE_QUEUE_ID;
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break;
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case BuiltinType::OCLReserveID:
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ID = PREDEF_TYPE_RESERVE_ID_ID;
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break;
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#define SVE_TYPE(Name, Id, SingletonId) \
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case BuiltinType::Id: \
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ID = PREDEF_TYPE_##Id##_ID; \
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break;
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#include "clang/Basic/AArch64SVEACLETypes.def"
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case BuiltinType::BuiltinFn:
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ID = PREDEF_TYPE_BUILTIN_FN;
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break;
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case BuiltinType::OMPArraySection:
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ID = PREDEF_TYPE_OMP_ARRAY_SECTION;
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break;
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case BuiltinType::OMPArrayShaping:
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ID = PREDEF_TYPE_OMP_ARRAY_SHAPING;
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break;
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case BuiltinType::OMPIterator:
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ID = PREDEF_TYPE_OMP_ITERATOR;
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break;
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}
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return TypeIdx(ID);
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}
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unsigned serialization::ComputeHash(Selector Sel) {
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unsigned N = Sel.getNumArgs();
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if (N == 0)
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++N;
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unsigned R = 5381;
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for (unsigned I = 0; I != N; ++I)
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if (IdentifierInfo *II = Sel.getIdentifierInfoForSlot(I))
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R = llvm::djbHash(II->getName(), R);
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return R;
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}
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const DeclContext *
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serialization::getDefinitiveDeclContext(const DeclContext *DC) {
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switch (DC->getDeclKind()) {
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// These entities may have multiple definitions.
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case Decl::TranslationUnit:
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case Decl::ExternCContext:
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case Decl::Namespace:
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case Decl::LinkageSpec:
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case Decl::Export:
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return nullptr;
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// C/C++ tag types can only be defined in one place.
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case Decl::Enum:
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case Decl::Record:
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if (const TagDecl *Def = cast<TagDecl>(DC)->getDefinition())
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return Def;
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return nullptr;
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// FIXME: These can be defined in one place... except special member
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// functions and out-of-line definitions.
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case Decl::CXXRecord:
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case Decl::ClassTemplateSpecialization:
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case Decl::ClassTemplatePartialSpecialization:
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return nullptr;
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// Each function, method, and block declaration is its own DeclContext.
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case Decl::Function:
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case Decl::CXXMethod:
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case Decl::CXXConstructor:
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case Decl::CXXDestructor:
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case Decl::CXXConversion:
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case Decl::ObjCMethod:
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case Decl::Block:
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case Decl::Captured:
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// Objective C categories, category implementations, and class
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// implementations can only be defined in one place.
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case Decl::ObjCCategory:
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case Decl::ObjCCategoryImpl:
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case Decl::ObjCImplementation:
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return DC;
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case Decl::ObjCProtocol:
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if (const ObjCProtocolDecl *Def
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= cast<ObjCProtocolDecl>(DC)->getDefinition())
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return Def;
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return nullptr;
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// FIXME: These are defined in one place, but properties in class extensions
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// end up being back-patched into the main interface. See
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// Sema::HandlePropertyInClassExtension for the offending code.
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case Decl::ObjCInterface:
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return nullptr;
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default:
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llvm_unreachable("Unhandled DeclContext in AST reader");
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}
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llvm_unreachable("Unhandled decl kind");
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}
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bool serialization::isRedeclarableDeclKind(unsigned Kind) {
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switch (static_cast<Decl::Kind>(Kind)) {
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case Decl::TranslationUnit:
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case Decl::ExternCContext:
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// Special case of a "merged" declaration.
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return true;
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case Decl::Namespace:
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case Decl::NamespaceAlias:
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case Decl::Typedef:
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case Decl::TypeAlias:
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case Decl::Enum:
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case Decl::Record:
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case Decl::CXXRecord:
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case Decl::ClassTemplateSpecialization:
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case Decl::ClassTemplatePartialSpecialization:
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case Decl::VarTemplateSpecialization:
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case Decl::VarTemplatePartialSpecialization:
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case Decl::Function:
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case Decl::CXXDeductionGuide:
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case Decl::CXXMethod:
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case Decl::CXXConstructor:
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case Decl::CXXDestructor:
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case Decl::CXXConversion:
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case Decl::UsingShadow:
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case Decl::ConstructorUsingShadow:
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case Decl::Var:
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case Decl::FunctionTemplate:
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case Decl::ClassTemplate:
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case Decl::VarTemplate:
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case Decl::TypeAliasTemplate:
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case Decl::ObjCProtocol:
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case Decl::ObjCInterface:
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case Decl::Empty:
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return true;
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// Never redeclarable.
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case Decl::UsingDirective:
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case Decl::Label:
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case Decl::UnresolvedUsingTypename:
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case Decl::TemplateTypeParm:
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case Decl::EnumConstant:
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case Decl::UnresolvedUsingValue:
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case Decl::IndirectField:
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case Decl::Field:
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case Decl::MSProperty:
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case Decl::MSGuid:
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case Decl::ObjCIvar:
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case Decl::ObjCAtDefsField:
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case Decl::NonTypeTemplateParm:
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case Decl::TemplateTemplateParm:
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case Decl::Using:
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case Decl::UsingPack:
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case Decl::ObjCMethod:
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case Decl::ObjCCategory:
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case Decl::ObjCCategoryImpl:
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case Decl::ObjCImplementation:
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case Decl::ObjCProperty:
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case Decl::ObjCCompatibleAlias:
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case Decl::LinkageSpec:
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case Decl::Export:
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case Decl::ObjCPropertyImpl:
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case Decl::PragmaComment:
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case Decl::PragmaDetectMismatch:
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case Decl::FileScopeAsm:
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case Decl::AccessSpec:
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case Decl::Friend:
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case Decl::FriendTemplate:
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case Decl::StaticAssert:
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case Decl::Block:
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case Decl::Captured:
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case Decl::ClassScopeFunctionSpecialization:
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case Decl::Import:
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case Decl::OMPThreadPrivate:
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case Decl::OMPAllocate:
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case Decl::OMPRequires:
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case Decl::OMPCapturedExpr:
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case Decl::OMPDeclareReduction:
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case Decl::OMPDeclareMapper:
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case Decl::BuiltinTemplate:
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case Decl::Decomposition:
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case Decl::Binding:
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case Decl::Concept:
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case Decl::LifetimeExtendedTemporary:
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case Decl::RequiresExprBody:
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return false;
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// These indirectly derive from Redeclarable<T> but are not actually
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// redeclarable.
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case Decl::ImplicitParam:
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case Decl::ParmVar:
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case Decl::ObjCTypeParam:
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return false;
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}
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llvm_unreachable("Unhandled declaration kind");
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}
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bool serialization::needsAnonymousDeclarationNumber(const NamedDecl *D) {
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// Friend declarations in dependent contexts aren't anonymous in the usual
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// sense, but they cannot be found by name lookup in their semantic context
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// (or indeed in any context), so we treat them as anonymous.
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//
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// This doesn't apply to friend tag decls; Sema makes those available to name
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// lookup in the surrounding context.
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if (D->getFriendObjectKind() &&
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D->getLexicalDeclContext()->isDependentContext() && !isa<TagDecl>(D)) {
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// For function templates and class templates, the template is numbered and
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// not its pattern.
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if (auto *FD = dyn_cast<FunctionDecl>(D))
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return !FD->getDescribedFunctionTemplate();
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if (auto *RD = dyn_cast<CXXRecordDecl>(D))
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return !RD->getDescribedClassTemplate();
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return true;
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}
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// At block scope, we number everything that we need to deduplicate, since we
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// can't just use name matching to keep things lined up.
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// FIXME: This is only necessary for an inline function or a template or
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// similar.
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if (D->getLexicalDeclContext()->isFunctionOrMethod()) {
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if (auto *VD = dyn_cast<VarDecl>(D))
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return VD->isStaticLocal();
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// FIXME: What about CapturedDecls (and declarations nested within them)?
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return isa<TagDecl>(D) || isa<BlockDecl>(D);
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}
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// Otherwise, we only care about anonymous class members / block-scope decls.
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// FIXME: We need to handle lambdas and blocks within inline / templated
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// variables too.
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if (D->getDeclName() || !isa<CXXRecordDecl>(D->getLexicalDeclContext()))
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return false;
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return isa<TagDecl>(D) || isa<FieldDecl>(D);
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}
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