xref: /freebsd/contrib/llvm-project/clang/lib/Basic/Attributes.cpp (revision 62cfcf62f627e5093fb37026a6d8c98e4d2ef04c)
1 #include "clang/Basic/Attributes.h"
2 #include "clang/Basic/AttrSubjectMatchRules.h"
3 #include "clang/Basic/AttributeCommonInfo.h"
4 #include "clang/Basic/IdentifierTable.h"
5 #include "llvm/ADT/StringSwitch.h"
6 using namespace clang;
7 
8 int clang::hasAttribute(AttrSyntax Syntax, const IdentifierInfo *Scope,
9                         const IdentifierInfo *Attr, const TargetInfo &Target,
10                         const LangOptions &LangOpts) {
11   StringRef Name = Attr->getName();
12   // Normalize the attribute name, __foo__ becomes foo.
13   if (Name.size() >= 4 && Name.startswith("__") && Name.endswith("__"))
14     Name = Name.substr(2, Name.size() - 4);
15 
16   // Normalize the scope name, but only for gnu and clang attributes.
17   StringRef ScopeName = Scope ? Scope->getName() : "";
18   if (ScopeName == "__gnu__")
19     ScopeName = "gnu";
20   else if (ScopeName == "_Clang")
21     ScopeName = "clang";
22 
23 #include "clang/Basic/AttrHasAttributeImpl.inc"
24 
25   return 0;
26 }
27 
28 const char *attr::getSubjectMatchRuleSpelling(attr::SubjectMatchRule Rule) {
29   switch (Rule) {
30 #define ATTR_MATCH_RULE(NAME, SPELLING, IsAbstract)                            \
31   case attr::NAME:                                                             \
32     return SPELLING;
33 #include "clang/Basic/AttrSubMatchRulesList.inc"
34   }
35   llvm_unreachable("Invalid subject match rule");
36 }
37 
38 static StringRef
39 normalizeAttrScopeName(StringRef ScopeName,
40                        AttributeCommonInfo::Syntax SyntaxUsed) {
41   // Normalize the "__gnu__" scope name to be "gnu" and the "_Clang" scope name
42   // to be "clang".
43   if (SyntaxUsed == AttributeCommonInfo::AS_CXX11 ||
44       SyntaxUsed == AttributeCommonInfo::AS_C2x) {
45     if (ScopeName == "__gnu__")
46       ScopeName = "gnu";
47     else if (ScopeName == "_Clang")
48       ScopeName = "clang";
49   }
50   return ScopeName;
51 }
52 
53 static StringRef normalizeAttrName(StringRef AttrName,
54                                    StringRef NormalizedScopeName,
55                                    AttributeCommonInfo::Syntax SyntaxUsed) {
56   // Normalize the attribute name, __foo__ becomes foo. This is only allowable
57   // for GNU attributes, and attributes using the double square bracket syntax.
58   bool ShouldNormalize =
59       SyntaxUsed == AttributeCommonInfo::AS_GNU ||
60       ((SyntaxUsed == AttributeCommonInfo::AS_CXX11 ||
61         SyntaxUsed == AttributeCommonInfo::AS_C2x) &&
62        (NormalizedScopeName.empty() || NormalizedScopeName == "gnu" ||
63         NormalizedScopeName == "clang"));
64   if (ShouldNormalize && AttrName.size() >= 4 && AttrName.startswith("__") &&
65       AttrName.endswith("__"))
66     AttrName = AttrName.slice(2, AttrName.size() - 2);
67 
68   return AttrName;
69 }
70 
71 bool AttributeCommonInfo::isGNUScope() const {
72   return ScopeName && (ScopeName->isStr("gnu") || ScopeName->isStr("__gnu__"));
73 }
74 
75 #include "clang/Sema/AttrParsedAttrKinds.inc"
76 
77 AttributeCommonInfo::Kind
78 AttributeCommonInfo::getParsedKind(const IdentifierInfo *Name,
79                                    const IdentifierInfo *ScopeName,
80                                    Syntax SyntaxUsed) {
81   StringRef AttrName = Name->getName();
82 
83   SmallString<64> FullName;
84   if (ScopeName)
85     FullName += normalizeAttrScopeName(ScopeName->getName(), SyntaxUsed);
86 
87   AttrName = normalizeAttrName(AttrName, FullName, SyntaxUsed);
88 
89   // Ensure that in the case of C++11 attributes, we look for '::foo' if it is
90   // unscoped.
91   if (ScopeName || SyntaxUsed == AS_CXX11 || SyntaxUsed == AS_C2x)
92     FullName += "::";
93   FullName += AttrName;
94 
95   return ::getAttrKind(FullName, SyntaxUsed);
96 }
97 
98 unsigned AttributeCommonInfo::calculateAttributeSpellingListIndex() const {
99   // Both variables will be used in tablegen generated
100   // attribute spell list index matching code.
101   auto Syntax = static_cast<AttributeCommonInfo::Syntax>(getSyntax());
102   StringRef Scope =
103       getScopeName() ? normalizeAttrScopeName(getScopeName()->getName(), Syntax)
104                      : "";
105   StringRef Name = normalizeAttrName(getAttrName()->getName(), Scope, Syntax);
106 
107 #include "clang/Sema/AttrSpellingListIndex.inc"
108 }
109