1 //===--- AttributeList.cpp --------------------------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the AttributeList class implementation
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Sema/AttributeList.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/Expr.h"
17 #include "clang/Basic/IdentifierTable.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/StringSwitch.h"
20 using namespace clang;
21
allocated_size() const22 size_t AttributeList::allocated_size() const {
23 if (IsAvailability) return AttributeFactory::AvailabilityAllocSize;
24 else if (IsTypeTagForDatatype)
25 return AttributeFactory::TypeTagForDatatypeAllocSize;
26 return (sizeof(AttributeList) + NumArgs * sizeof(Expr*));
27 }
28
AttributeFactory()29 AttributeFactory::AttributeFactory() {
30 // Go ahead and configure all the inline capacity. This is just a memset.
31 FreeLists.resize(InlineFreeListsCapacity);
32 }
~AttributeFactory()33 AttributeFactory::~AttributeFactory() {}
34
getFreeListIndexForSize(size_t size)35 static size_t getFreeListIndexForSize(size_t size) {
36 assert(size >= sizeof(AttributeList));
37 assert((size % sizeof(void*)) == 0);
38 return ((size - sizeof(AttributeList)) / sizeof(void*));
39 }
40
allocate(size_t size)41 void *AttributeFactory::allocate(size_t size) {
42 // Check for a previously reclaimed attribute.
43 size_t index = getFreeListIndexForSize(size);
44 if (index < FreeLists.size()) {
45 if (AttributeList *attr = FreeLists[index]) {
46 FreeLists[index] = attr->NextInPool;
47 return attr;
48 }
49 }
50
51 // Otherwise, allocate something new.
52 return Alloc.Allocate(size, llvm::AlignOf<AttributeFactory>::Alignment);
53 }
54
reclaimPool(AttributeList * cur)55 void AttributeFactory::reclaimPool(AttributeList *cur) {
56 assert(cur && "reclaiming empty pool!");
57 do {
58 // Read this here, because we're going to overwrite NextInPool
59 // when we toss 'cur' into the appropriate queue.
60 AttributeList *next = cur->NextInPool;
61
62 size_t size = cur->allocated_size();
63 size_t freeListIndex = getFreeListIndexForSize(size);
64
65 // Expand FreeLists to the appropriate size, if required.
66 if (freeListIndex >= FreeLists.size())
67 FreeLists.resize(freeListIndex+1);
68
69 // Add 'cur' to the appropriate free-list.
70 cur->NextInPool = FreeLists[freeListIndex];
71 FreeLists[freeListIndex] = cur;
72
73 cur = next;
74 } while (cur);
75 }
76
takePool(AttributeList * pool)77 void AttributePool::takePool(AttributeList *pool) {
78 assert(pool);
79
80 // Fast path: this pool is empty.
81 if (!Head) {
82 Head = pool;
83 return;
84 }
85
86 // Reverse the pool onto the current head. This optimizes for the
87 // pattern of pulling a lot of pools into a single pool.
88 do {
89 AttributeList *next = pool->NextInPool;
90 pool->NextInPool = Head;
91 Head = pool;
92 pool = next;
93 } while (pool);
94 }
95
96 AttributeList *
createIntegerAttribute(ASTContext & C,IdentifierInfo * Name,SourceLocation TokLoc,int Arg)97 AttributePool::createIntegerAttribute(ASTContext &C, IdentifierInfo *Name,
98 SourceLocation TokLoc, int Arg) {
99 Expr *IArg = IntegerLiteral::Create(C, llvm::APInt(32, (uint64_t) Arg),
100 C.IntTy, TokLoc);
101 return create(Name, TokLoc, 0, TokLoc, 0, TokLoc, &IArg, 1,
102 AttributeList::AS_GNU);
103 }
104
105 #include "clang/Sema/AttrParsedAttrKinds.inc"
106
getKind(const IdentifierInfo * Name,const IdentifierInfo * ScopeName,Syntax SyntaxUsed)107 AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name,
108 const IdentifierInfo *ScopeName,
109 Syntax SyntaxUsed) {
110 StringRef AttrName = Name->getName();
111
112 // Normalize the attribute name, __foo__ becomes foo.
113 if (AttrName.startswith("__") && AttrName.endswith("__") &&
114 AttrName.size() >= 4)
115 AttrName = AttrName.substr(2, AttrName.size() - 4);
116
117 SmallString<64> Buf;
118 if (ScopeName)
119 Buf += ScopeName->getName();
120 // Ensure that in the case of C++11 attributes, we look for '::foo' if it is
121 // unscoped.
122 if (ScopeName || SyntaxUsed == AS_CXX11)
123 Buf += "::";
124 Buf += AttrName;
125
126 return ::getAttrKind(Buf);
127 }
128
getAttributeSpellingListIndex() const129 unsigned AttributeList::getAttributeSpellingListIndex() const {
130 // Both variables will be used in tablegen generated
131 // attribute spell list index matching code.
132 StringRef Name = AttrName->getName();
133 StringRef Scope = ScopeName ? ScopeName->getName() : "";
134
135 #include "clang/Sema/AttrSpellingListIndex.inc"
136
137 }
138
139