1 //======- ParsedAttr.cpp --------------------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the ParsedAttr class implementation
11 //===----------------------------------------------------------------------===//
13 #include "clang/Sema/ParsedAttr.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/Basic/AttrSubjectMatchRules.h"
16 #include "clang/Basic/IdentifierTable.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "clang/Sema/SemaInternal.h"
19 #include "llvm/ADT/SmallString.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringRef.h"
26 using namespace clang;
28 IdentifierLoc *IdentifierLoc::create(ASTContext &Ctx, SourceLocation Loc,
29 IdentifierInfo *Ident) {
30 IdentifierLoc *Result = new (Ctx) IdentifierLoc;
32 Result->Ident = Ident;
36 size_t ParsedAttr::allocated_size() const {
37 if (IsAvailability) return AttributeFactory::AvailabilityAllocSize;
38 else if (IsTypeTagForDatatype)
39 return AttributeFactory::TypeTagForDatatypeAllocSize;
41 return AttributeFactory::PropertyAllocSize;
42 else if (HasParsedType)
43 return totalSizeToAlloc<ArgsUnion, detail::AvailabilityData,
44 detail::TypeTagForDatatypeData, ParsedType,
45 detail::PropertyData>(0, 0, 0, 1, 0);
46 return totalSizeToAlloc<ArgsUnion, detail::AvailabilityData,
47 detail::TypeTagForDatatypeData, ParsedType,
48 detail::PropertyData>(NumArgs, 0, 0, 0, 0);
51 AttributeFactory::AttributeFactory() {
52 // Go ahead and configure all the inline capacity. This is just a memset.
53 FreeLists.resize(InlineFreeListsCapacity);
55 AttributeFactory::~AttributeFactory() = default;
57 static size_t getFreeListIndexForSize(size_t size) {
58 assert(size >= sizeof(ParsedAttr));
59 assert((size % sizeof(void*)) == 0);
60 return ((size - sizeof(ParsedAttr)) / sizeof(void *));
63 void *AttributeFactory::allocate(size_t size) {
64 // Check for a previously reclaimed attribute.
65 size_t index = getFreeListIndexForSize(size);
66 if (index < FreeLists.size() && !FreeLists[index].empty()) {
67 ParsedAttr *attr = FreeLists[index].back();
68 FreeLists[index].pop_back();
72 // Otherwise, allocate something new.
73 return Alloc.Allocate(size, alignof(AttributeFactory));
76 void AttributeFactory::deallocate(ParsedAttr *Attr) {
77 size_t size = Attr->allocated_size();
78 size_t freeListIndex = getFreeListIndexForSize(size);
80 // Expand FreeLists to the appropriate size, if required.
81 if (freeListIndex >= FreeLists.size())
82 FreeLists.resize(freeListIndex + 1);
85 // In debug mode, zero out the attribute to help find memory overwriting.
86 memset(Attr, 0, size);
89 // Add 'Attr' to the appropriate free-list.
90 FreeLists[freeListIndex].push_back(Attr);
93 void AttributeFactory::reclaimPool(AttributePool &cur) {
94 for (ParsedAttr *AL : cur.Attrs)
98 void AttributePool::takePool(AttributePool &pool) {
99 Attrs.insert(Attrs.end(), pool.Attrs.begin(), pool.Attrs.end());
103 #include "clang/Sema/AttrParsedAttrKinds.inc"
105 static StringRef normalizeAttrScopeName(StringRef ScopeName,
106 ParsedAttr::Syntax SyntaxUsed) {
107 // Normalize the "__gnu__" scope name to be "gnu" and the "_Clang" scope name
109 if (SyntaxUsed == ParsedAttr::AS_CXX11 ||
110 SyntaxUsed == ParsedAttr::AS_C2x) {
111 if (ScopeName == "__gnu__")
113 else if (ScopeName == "_Clang")
119 static StringRef normalizeAttrName(StringRef AttrName,
120 StringRef NormalizedScopeName,
121 ParsedAttr::Syntax SyntaxUsed) {
122 // Normalize the attribute name, __foo__ becomes foo. This is only allowable
123 // for GNU attributes, and attributes using the double square bracket syntax.
124 bool ShouldNormalize =
125 SyntaxUsed == ParsedAttr::AS_GNU ||
126 ((SyntaxUsed == ParsedAttr::AS_CXX11 ||
127 SyntaxUsed == ParsedAttr::AS_C2x) &&
128 (NormalizedScopeName == "gnu" || NormalizedScopeName == "clang"));
129 if (ShouldNormalize && AttrName.size() >= 4 && AttrName.startswith("__") &&
130 AttrName.endswith("__"))
131 AttrName = AttrName.slice(2, AttrName.size() - 2);
136 ParsedAttr::Kind ParsedAttr::getKind(const IdentifierInfo *Name,
137 const IdentifierInfo *ScopeName,
139 StringRef AttrName = Name->getName();
141 SmallString<64> FullName;
143 FullName += normalizeAttrScopeName(ScopeName->getName(), SyntaxUsed);
145 AttrName = normalizeAttrName(AttrName, FullName, SyntaxUsed);
147 // Ensure that in the case of C++11 attributes, we look for '::foo' if it is
149 if (ScopeName || SyntaxUsed == AS_CXX11 || SyntaxUsed == AS_C2x)
151 FullName += AttrName;
153 return ::getAttrKind(FullName, SyntaxUsed);
156 unsigned ParsedAttr::getAttributeSpellingListIndex() const {
157 // Both variables will be used in tablegen generated
158 // attribute spell list index matching code.
159 auto Syntax = static_cast<ParsedAttr::Syntax>(SyntaxUsed);
161 ScopeName ? normalizeAttrScopeName(ScopeName->getName(), Syntax) : "";
162 StringRef Name = normalizeAttrName(AttrName->getName(), Scope, Syntax);
164 #include "clang/Sema/AttrSpellingListIndex.inc"
168 struct ParsedAttrInfo {
169 unsigned NumArgs : 4;
170 unsigned OptArgs : 4;
171 unsigned HasCustomParsing : 1;
172 unsigned IsTargetSpecific : 1;
175 unsigned IsKnownToGCC : 1;
176 unsigned IsSupportedByPragmaAttribute : 1;
178 bool (*DiagAppertainsToDecl)(Sema &S, const ParsedAttr &Attr, const Decl *);
179 bool (*DiagLangOpts)(Sema &S, const ParsedAttr &Attr);
180 bool (*ExistsInTarget)(const TargetInfo &Target);
181 unsigned (*SpellingIndexToSemanticSpelling)(const ParsedAttr &Attr);
182 void (*GetPragmaAttributeMatchRules)(
183 llvm::SmallVectorImpl<std::pair<attr::SubjectMatchRule, bool>> &Rules,
184 const LangOptions &LangOpts);
189 #include "clang/Sema/AttrParsedAttrImpl.inc"
193 static const ParsedAttrInfo &getInfo(const ParsedAttr &A) {
194 return AttrInfoMap[A.getKind()];
197 unsigned ParsedAttr::getMinArgs() const { return getInfo(*this).NumArgs; }
199 unsigned ParsedAttr::getMaxArgs() const {
200 return getMinArgs() + getInfo(*this).OptArgs;
203 bool ParsedAttr::hasCustomParsing() const {
204 return getInfo(*this).HasCustomParsing;
207 bool ParsedAttr::diagnoseAppertainsTo(Sema &S, const Decl *D) const {
208 return getInfo(*this).DiagAppertainsToDecl(S, *this, D);
211 bool ParsedAttr::appliesToDecl(const Decl *D,
212 attr::SubjectMatchRule MatchRule) const {
213 return checkAttributeMatchRuleAppliesTo(D, MatchRule);
216 void ParsedAttr::getMatchRules(
217 const LangOptions &LangOpts,
218 SmallVectorImpl<std::pair<attr::SubjectMatchRule, bool>> &MatchRules)
220 return getInfo(*this).GetPragmaAttributeMatchRules(MatchRules, LangOpts);
223 bool ParsedAttr::diagnoseLangOpts(Sema &S) const {
224 return getInfo(*this).DiagLangOpts(S, *this);
227 bool ParsedAttr::isTargetSpecificAttr() const {
228 return getInfo(*this).IsTargetSpecific;
231 bool ParsedAttr::isTypeAttr() const { return getInfo(*this).IsType; }
233 bool ParsedAttr::isStmtAttr() const { return getInfo(*this).IsStmt; }
235 bool ParsedAttr::existsInTarget(const TargetInfo &Target) const {
236 return getInfo(*this).ExistsInTarget(Target);
239 bool ParsedAttr::isKnownToGCC() const { return getInfo(*this).IsKnownToGCC; }
241 bool ParsedAttr::isSupportedByPragmaAttribute() const {
242 return getInfo(*this).IsSupportedByPragmaAttribute;
245 unsigned ParsedAttr::getSemanticSpelling() const {
246 return getInfo(*this).SpellingIndexToSemanticSpelling(*this);
249 bool ParsedAttr::hasVariadicArg() const {
250 // If the attribute has the maximum number of optional arguments, we will
251 // claim that as being variadic. If we someday get an attribute that
252 // legitimately bumps up against that maximum, we can use another bit to track
253 // whether it's truly variadic or not.
254 return getInfo(*this).OptArgs == 15;