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/Expr.h"
16 #include "clang/Basic/IdentifierTable.h"
17 #include "llvm/ADT/StringSwitch.h"
18 using namespace clang;
19
allocated_size() const20 size_t AttributeList::allocated_size() const {
21 if (IsAvailability) return AttributeFactory::AvailabilityAllocSize;
22 return (sizeof(AttributeList) + NumArgs * sizeof(Expr*));
23 }
24
AttributeFactory()25 AttributeFactory::AttributeFactory() {
26 // Go ahead and configure all the inline capacity. This is just a memset.
27 FreeLists.resize(InlineFreeListsCapacity);
28 }
~AttributeFactory()29 AttributeFactory::~AttributeFactory() {}
30
getFreeListIndexForSize(size_t size)31 static size_t getFreeListIndexForSize(size_t size) {
32 assert(size >= sizeof(AttributeList));
33 assert((size % sizeof(void*)) == 0);
34 return ((size - sizeof(AttributeList)) / sizeof(void*));
35 }
36
allocate(size_t size)37 void *AttributeFactory::allocate(size_t size) {
38 // Check for a previously reclaimed attribute.
39 size_t index = getFreeListIndexForSize(size);
40 if (index < FreeLists.size()) {
41 if (AttributeList *attr = FreeLists[index]) {
42 FreeLists[index] = attr->NextInPool;
43 return attr;
44 }
45 }
46
47 // Otherwise, allocate something new.
48 return Alloc.Allocate(size, llvm::AlignOf<AttributeFactory>::Alignment);
49 }
50
reclaimPool(AttributeList * cur)51 void AttributeFactory::reclaimPool(AttributeList *cur) {
52 assert(cur && "reclaiming empty pool!");
53 do {
54 // Read this here, because we're going to overwrite NextInPool
55 // when we toss 'cur' into the appropriate queue.
56 AttributeList *next = cur->NextInPool;
57
58 size_t size = cur->allocated_size();
59 size_t freeListIndex = getFreeListIndexForSize(size);
60
61 // Expand FreeLists to the appropriate size, if required.
62 if (freeListIndex >= FreeLists.size())
63 FreeLists.resize(freeListIndex+1);
64
65 // Add 'cur' to the appropriate free-list.
66 cur->NextInPool = FreeLists[freeListIndex];
67 FreeLists[freeListIndex] = cur;
68
69 cur = next;
70 } while (cur);
71 }
72
takePool(AttributeList * pool)73 void AttributePool::takePool(AttributeList *pool) {
74 assert(pool);
75
76 // Fast path: this pool is empty.
77 if (!Head) {
78 Head = pool;
79 return;
80 }
81
82 // Reverse the pool onto the current head. This optimizes for the
83 // pattern of pulling a lot of pools into a single pool.
84 do {
85 AttributeList *next = pool->NextInPool;
86 pool->NextInPool = Head;
87 Head = pool;
88 pool = next;
89 } while (pool);
90 }
91
92 AttributeList *
createIntegerAttribute(ASTContext & C,IdentifierInfo * Name,SourceLocation TokLoc,int Arg)93 AttributePool::createIntegerAttribute(ASTContext &C, IdentifierInfo *Name,
94 SourceLocation TokLoc, int Arg) {
95 Expr *IArg = IntegerLiteral::Create(C, llvm::APInt(32, (uint64_t) Arg),
96 C.IntTy, TokLoc);
97 return create(Name, TokLoc, 0, TokLoc, 0, TokLoc, &IArg, 1, 0);
98 }
99
getKind(const IdentifierInfo * Name)100 AttributeList::Kind AttributeList::getKind(const IdentifierInfo *Name) {
101 StringRef AttrName = Name->getName();
102
103 // Normalize the attribute name, __foo__ becomes foo.
104 if (AttrName.startswith("__") && AttrName.endswith("__") &&
105 AttrName.size() >= 4)
106 AttrName = AttrName.substr(2, AttrName.size() - 4);
107
108 return llvm::StringSwitch<AttributeList::Kind>(AttrName)
109 #include "clang/Sema/AttrParsedAttrKinds.inc"
110 .Case("address_space", AT_address_space)
111 .Case("align", AT_aligned) // FIXME - should it be "aligned"?
112 .Case("base_check", AT_base_check)
113 .Case("bounded", IgnoredAttribute) // OpenBSD
114 .Case("__const", AT_const) // some GCC headers do contain this spelling
115 .Case("cf_returns_autoreleased", AT_cf_returns_autoreleased)
116 .Case("mode", AT_mode)
117 .Case("vec_type_hint", IgnoredAttribute)
118 .Case("ext_vector_type", AT_ext_vector_type)
119 .Case("neon_vector_type", AT_neon_vector_type)
120 .Case("neon_polyvector_type", AT_neon_polyvector_type)
121 .Case("opencl_image_access", AT_opencl_image_access)
122 .Case("objc_gc", AT_objc_gc)
123 .Case("objc_ownership", AT_objc_ownership)
124 .Case("vector_size", AT_vector_size)
125 .Default(UnknownAttribute);
126 }
127