1 //===--- AttributeList.cpp --------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the AttributeList class implementation
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/AttributeList.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/AST/Expr.h"
19 #include "clang/Basic/AttrSubjectMatchRules.h"
20 #include "clang/Basic/IdentifierTable.h"
21 #include "clang/Basic/TargetInfo.h"
22 #include "clang/Sema/SemaInternal.h"
23 #include "llvm/ADT/SmallString.h"
24 using namespace clang;
26 IdentifierLoc *IdentifierLoc::create(ASTContext &Ctx, SourceLocation Loc,
27 IdentifierInfo *Ident) {
28 IdentifierLoc *Result = new (Ctx) IdentifierLoc;
30 Result->Ident = Ident;
34 size_t AttributeList::allocated_size() const {
35 if (IsAvailability) return AttributeFactory::AvailabilityAllocSize;
36 else if (IsTypeTagForDatatype)
37 return AttributeFactory::TypeTagForDatatypeAllocSize;
39 return AttributeFactory::PropertyAllocSize;
40 return (sizeof(AttributeList) + NumArgs * sizeof(ArgsUnion));
43 AttributeFactory::AttributeFactory() {
44 // Go ahead and configure all the inline capacity. This is just a memset.
45 FreeLists.resize(InlineFreeListsCapacity);
47 AttributeFactory::~AttributeFactory() {}
49 static size_t getFreeListIndexForSize(size_t size) {
50 assert(size >= sizeof(AttributeList));
51 assert((size % sizeof(void*)) == 0);
52 return ((size - sizeof(AttributeList)) / sizeof(void*));
55 void *AttributeFactory::allocate(size_t size) {
56 // Check for a previously reclaimed attribute.
57 size_t index = getFreeListIndexForSize(size);
58 if (index < FreeLists.size()) {
59 if (AttributeList *attr = FreeLists[index]) {
60 FreeLists[index] = attr->NextInPool;
65 // Otherwise, allocate something new.
66 return Alloc.Allocate(size, alignof(AttributeFactory));
69 void AttributeFactory::reclaimPool(AttributeList *cur) {
70 assert(cur && "reclaiming empty pool!");
72 // Read this here, because we're going to overwrite NextInPool
73 // when we toss 'cur' into the appropriate queue.
74 AttributeList *next = cur->NextInPool;
76 size_t size = cur->allocated_size();
77 size_t freeListIndex = getFreeListIndexForSize(size);
79 // Expand FreeLists to the appropriate size, if required.
80 if (freeListIndex >= FreeLists.size())
81 FreeLists.resize(freeListIndex+1);
83 // Add 'cur' to the appropriate free-list.
84 cur->NextInPool = FreeLists[freeListIndex];
85 FreeLists[freeListIndex] = cur;
91 void AttributePool::takePool(AttributeList *pool) {
94 // Fast path: this pool is empty.
100 // Reverse the pool onto the current head. This optimizes for the
101 // pattern of pulling a lot of pools into a single pool.
103 AttributeList *next = pool->NextInPool;
104 pool->NextInPool = Head;
110 #include "clang/Sema/AttrParsedAttrKinds.inc"
112 static StringRef normalizeAttrName(StringRef AttrName, StringRef ScopeName,
113 AttributeList::Syntax SyntaxUsed) {
114 // Normalize the attribute name, __foo__ becomes foo. This is only allowable
115 // for GNU attributes.
116 bool IsGNU = SyntaxUsed == AttributeList::AS_GNU ||
117 ((SyntaxUsed == AttributeList::AS_CXX11 ||
118 SyntaxUsed == AttributeList::AS_C2x) && ScopeName == "gnu");
119 if (IsGNU && AttrName.size() >= 4 && AttrName.startswith("__") &&
120 AttrName.endswith("__"))
121 AttrName = AttrName.slice(2, AttrName.size() - 2);
126 AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name,
127 const IdentifierInfo *ScopeName,
129 StringRef AttrName = Name->getName();
131 SmallString<64> FullName;
133 FullName += ScopeName->getName();
135 AttrName = normalizeAttrName(AttrName, FullName, SyntaxUsed);
137 // Ensure that in the case of C++11 attributes, we look for '::foo' if it is
139 if (ScopeName || SyntaxUsed == AS_CXX11 || SyntaxUsed == AS_C2x)
141 FullName += AttrName;
143 return ::getAttrKind(FullName, SyntaxUsed);
146 unsigned AttributeList::getAttributeSpellingListIndex() const {
147 // Both variables will be used in tablegen generated
148 // attribute spell list index matching code.
149 StringRef Scope = ScopeName ? ScopeName->getName() : "";
150 StringRef Name = normalizeAttrName(AttrName->getName(), Scope,
151 (AttributeList::Syntax)SyntaxUsed);
153 #include "clang/Sema/AttrSpellingListIndex.inc"
157 struct ParsedAttrInfo {
158 unsigned NumArgs : 4;
159 unsigned OptArgs : 4;
160 unsigned HasCustomParsing : 1;
161 unsigned IsTargetSpecific : 1;
164 unsigned IsKnownToGCC : 1;
165 unsigned IsSupportedByPragmaAttribute : 1;
167 bool (*DiagAppertainsToDecl)(Sema &S, const AttributeList &Attr,
169 bool (*DiagLangOpts)(Sema &S, const AttributeList &Attr);
170 bool (*ExistsInTarget)(const TargetInfo &Target);
171 unsigned (*SpellingIndexToSemanticSpelling)(const AttributeList &Attr);
172 void (*GetPragmaAttributeMatchRules)(
173 llvm::SmallVectorImpl<std::pair<attr::SubjectMatchRule, bool>> &Rules,
174 const LangOptions &LangOpts);
178 #include "clang/Sema/AttrParsedAttrImpl.inc"
181 static const ParsedAttrInfo &getInfo(const AttributeList &A) {
182 return AttrInfoMap[A.getKind()];
185 unsigned AttributeList::getMinArgs() const {
186 return getInfo(*this).NumArgs;
189 unsigned AttributeList::getMaxArgs() const {
190 return getMinArgs() + getInfo(*this).OptArgs;
193 bool AttributeList::hasCustomParsing() const {
194 return getInfo(*this).HasCustomParsing;
197 bool AttributeList::diagnoseAppertainsTo(Sema &S, const Decl *D) const {
198 return getInfo(*this).DiagAppertainsToDecl(S, *this, D);
201 bool AttributeList::appliesToDecl(const Decl *D,
202 attr::SubjectMatchRule MatchRule) const {
203 return checkAttributeMatchRuleAppliesTo(D, MatchRule);
206 void AttributeList::getMatchRules(
207 const LangOptions &LangOpts,
208 SmallVectorImpl<std::pair<attr::SubjectMatchRule, bool>> &MatchRules)
210 return getInfo(*this).GetPragmaAttributeMatchRules(MatchRules, LangOpts);
213 bool AttributeList::diagnoseLangOpts(Sema &S) const {
214 return getInfo(*this).DiagLangOpts(S, *this);
217 bool AttributeList::isTargetSpecificAttr() const {
218 return getInfo(*this).IsTargetSpecific;
221 bool AttributeList::isTypeAttr() const {
222 return getInfo(*this).IsType;
225 bool AttributeList::isStmtAttr() const {
226 return getInfo(*this).IsStmt;
229 bool AttributeList::existsInTarget(const TargetInfo &Target) const {
230 return getInfo(*this).ExistsInTarget(Target);
233 bool AttributeList::isKnownToGCC() const {
234 return getInfo(*this).IsKnownToGCC;
237 bool AttributeList::isSupportedByPragmaAttribute() const {
238 return getInfo(*this).IsSupportedByPragmaAttribute;
241 unsigned AttributeList::getSemanticSpelling() const {
242 return getInfo(*this).SpellingIndexToSemanticSpelling(*this);
245 bool AttributeList::hasVariadicArg() const {
246 // If the attribute has the maximum number of optional arguments, we will
247 // claim that as being variadic. If we someday get an attribute that
248 // legitimately bumps up against that maximum, we can use another bit to track
249 // whether it's truly variadic or not.
250 return getInfo(*this).OptArgs == 15;