forked from OSchip/llvm-project
531 lines
18 KiB
C++
531 lines
18 KiB
C++
//===--- IdentifierTable.cpp - Hash table for identifier lookup -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the IdentifierInfo, IdentifierVisitor, and
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// IdentifierTable interfaces.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/IdentifierTable.h"
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#include "clang/Basic/CharInfo.h"
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#include "clang/Basic/LangOptions.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstdio>
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// IdentifierInfo Implementation
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//===----------------------------------------------------------------------===//
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IdentifierInfo::IdentifierInfo() {
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TokenID = tok::identifier;
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ObjCOrBuiltinID = 0;
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HasMacro = false;
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HadMacro = false;
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IsExtension = false;
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IsCXX11CompatKeyword = false;
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IsPoisoned = false;
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IsCPPOperatorKeyword = false;
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NeedsHandleIdentifier = false;
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IsFromAST = false;
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ChangedAfterLoad = false;
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RevertedTokenID = false;
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OutOfDate = false;
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IsModulesImport = false;
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FETokenInfo = 0;
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Entry = 0;
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}
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//===----------------------------------------------------------------------===//
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// IdentifierTable Implementation
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//===----------------------------------------------------------------------===//
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IdentifierIterator::~IdentifierIterator() { }
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IdentifierInfoLookup::~IdentifierInfoLookup() {}
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namespace {
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/// \brief A simple identifier lookup iterator that represents an
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/// empty sequence of identifiers.
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class EmptyLookupIterator : public IdentifierIterator
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{
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public:
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virtual StringRef Next() { return StringRef(); }
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};
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}
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IdentifierIterator *IdentifierInfoLookup::getIdentifiers() const {
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return new EmptyLookupIterator();
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}
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ExternalIdentifierLookup::~ExternalIdentifierLookup() {}
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IdentifierTable::IdentifierTable(const LangOptions &LangOpts,
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IdentifierInfoLookup* externalLookup)
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: HashTable(8192), // Start with space for 8K identifiers.
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ExternalLookup(externalLookup) {
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// Populate the identifier table with info about keywords for the current
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// language.
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AddKeywords(LangOpts);
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// Add the '_experimental_modules_import' contextual keyword.
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get("import").setModulesImport(true);
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}
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//===----------------------------------------------------------------------===//
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// Language Keyword Implementation
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//===----------------------------------------------------------------------===//
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// Constants for TokenKinds.def
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namespace {
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enum {
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KEYC99 = 0x1,
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KEYCXX = 0x2,
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KEYCXX11 = 0x4,
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KEYGNU = 0x8,
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KEYMS = 0x10,
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BOOLSUPPORT = 0x20,
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KEYALTIVEC = 0x40,
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KEYNOCXX = 0x80,
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KEYBORLAND = 0x100,
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KEYOPENCL = 0x200,
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KEYC11 = 0x400,
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KEYARC = 0x800,
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KEYNOMS = 0x01000,
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WCHARSUPPORT = 0x02000,
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KEYALL = (0xffff & ~KEYNOMS) // Because KEYNOMS is used to exclude.
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};
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}
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/// AddKeyword - This method is used to associate a token ID with specific
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/// identifiers because they are language keywords. This causes the lexer to
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/// automatically map matching identifiers to specialized token codes.
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///
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/// The C90/C99/CPP/CPP0x flags are set to 3 if the token is a keyword in a
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/// future language standard, set to 2 if the token should be enabled in the
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/// specified language, set to 1 if it is an extension in the specified
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/// language, and set to 0 if disabled in the specified language.
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static void AddKeyword(StringRef Keyword,
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tok::TokenKind TokenCode, unsigned Flags,
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const LangOptions &LangOpts, IdentifierTable &Table) {
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unsigned AddResult = 0;
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if (Flags == KEYALL) AddResult = 2;
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else if (LangOpts.CPlusPlus && (Flags & KEYCXX)) AddResult = 2;
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else if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) AddResult = 2;
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else if (LangOpts.C99 && (Flags & KEYC99)) AddResult = 2;
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else if (LangOpts.GNUKeywords && (Flags & KEYGNU)) AddResult = 1;
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else if (LangOpts.MicrosoftExt && (Flags & KEYMS)) AddResult = 1;
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else if (LangOpts.Borland && (Flags & KEYBORLAND)) AddResult = 1;
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else if (LangOpts.Bool && (Flags & BOOLSUPPORT)) AddResult = 2;
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else if (LangOpts.WChar && (Flags & WCHARSUPPORT)) AddResult = 2;
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else if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) AddResult = 2;
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else if (LangOpts.OpenCL && (Flags & KEYOPENCL)) AddResult = 2;
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else if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) AddResult = 2;
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else if (LangOpts.C11 && (Flags & KEYC11)) AddResult = 2;
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// We treat bridge casts as objective-C keywords so we can warn on them
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// in non-arc mode.
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else if (LangOpts.ObjC2 && (Flags & KEYARC)) AddResult = 2;
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else if (LangOpts.CPlusPlus && (Flags & KEYCXX11)) AddResult = 3;
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// Don't add this keyword under MicrosoftMode.
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if (LangOpts.MicrosoftMode && (Flags & KEYNOMS))
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return;
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// Don't add this keyword if disabled in this language.
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if (AddResult == 0) return;
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IdentifierInfo &Info =
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Table.get(Keyword, AddResult == 3 ? tok::identifier : TokenCode);
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Info.setIsExtensionToken(AddResult == 1);
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Info.setIsCXX11CompatKeyword(AddResult == 3);
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}
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/// AddCXXOperatorKeyword - Register a C++ operator keyword alternative
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/// representations.
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static void AddCXXOperatorKeyword(StringRef Keyword,
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tok::TokenKind TokenCode,
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IdentifierTable &Table) {
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IdentifierInfo &Info = Table.get(Keyword, TokenCode);
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Info.setIsCPlusPlusOperatorKeyword();
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}
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/// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector"
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/// or "property".
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static void AddObjCKeyword(StringRef Name,
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tok::ObjCKeywordKind ObjCID,
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IdentifierTable &Table) {
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Table.get(Name).setObjCKeywordID(ObjCID);
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}
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/// AddKeywords - Add all keywords to the symbol table.
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///
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void IdentifierTable::AddKeywords(const LangOptions &LangOpts) {
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// Add keywords and tokens for the current language.
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#define KEYWORD(NAME, FLAGS) \
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AddKeyword(StringRef(#NAME), tok::kw_ ## NAME, \
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FLAGS, LangOpts, *this);
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#define ALIAS(NAME, TOK, FLAGS) \
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AddKeyword(StringRef(NAME), tok::kw_ ## TOK, \
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FLAGS, LangOpts, *this);
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#define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \
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if (LangOpts.CXXOperatorNames) \
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AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this);
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#define OBJC1_AT_KEYWORD(NAME) \
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if (LangOpts.ObjC1) \
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AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
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#define OBJC2_AT_KEYWORD(NAME) \
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if (LangOpts.ObjC2) \
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AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
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#define TESTING_KEYWORD(NAME, FLAGS)
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#include "clang/Basic/TokenKinds.def"
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if (LangOpts.ParseUnknownAnytype)
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AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL,
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LangOpts, *this);
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}
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tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const {
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// We use a perfect hash function here involving the length of the keyword,
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// the first and third character. For preprocessor ID's there are no
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// collisions (if there were, the switch below would complain about duplicate
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// case values). Note that this depends on 'if' being null terminated.
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#define HASH(LEN, FIRST, THIRD) \
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(LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31)
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#define CASE(LEN, FIRST, THIRD, NAME) \
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case HASH(LEN, FIRST, THIRD): \
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return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME
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unsigned Len = getLength();
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if (Len < 2) return tok::pp_not_keyword;
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const char *Name = getNameStart();
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switch (HASH(Len, Name[0], Name[2])) {
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default: return tok::pp_not_keyword;
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CASE( 2, 'i', '\0', if);
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CASE( 4, 'e', 'i', elif);
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CASE( 4, 'e', 's', else);
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CASE( 4, 'l', 'n', line);
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CASE( 4, 's', 'c', sccs);
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CASE( 5, 'e', 'd', endif);
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CASE( 5, 'e', 'r', error);
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CASE( 5, 'i', 'e', ident);
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CASE( 5, 'i', 'd', ifdef);
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CASE( 5, 'u', 'd', undef);
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CASE( 6, 'a', 's', assert);
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CASE( 6, 'd', 'f', define);
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CASE( 6, 'i', 'n', ifndef);
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CASE( 6, 'i', 'p', import);
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CASE( 6, 'p', 'a', pragma);
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CASE( 7, 'd', 'f', defined);
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CASE( 7, 'i', 'c', include);
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CASE( 7, 'w', 'r', warning);
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CASE( 8, 'u', 'a', unassert);
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CASE(12, 'i', 'c', include_next);
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CASE(14, '_', 'p', __public_macro);
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CASE(15, '_', 'p', __private_macro);
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CASE(16, '_', 'i', __include_macros);
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#undef CASE
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#undef HASH
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}
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}
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//===----------------------------------------------------------------------===//
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// Stats Implementation
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//===----------------------------------------------------------------------===//
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/// PrintStats - Print statistics about how well the identifier table is doing
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/// at hashing identifiers.
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void IdentifierTable::PrintStats() const {
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unsigned NumBuckets = HashTable.getNumBuckets();
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unsigned NumIdentifiers = HashTable.getNumItems();
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unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers;
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unsigned AverageIdentifierSize = 0;
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unsigned MaxIdentifierLength = 0;
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// TODO: Figure out maximum times an identifier had to probe for -stats.
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for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator
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I = HashTable.begin(), E = HashTable.end(); I != E; ++I) {
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unsigned IdLen = I->getKeyLength();
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AverageIdentifierSize += IdLen;
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if (MaxIdentifierLength < IdLen)
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MaxIdentifierLength = IdLen;
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}
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fprintf(stderr, "\n*** Identifier Table Stats:\n");
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fprintf(stderr, "# Identifiers: %d\n", NumIdentifiers);
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fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets);
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fprintf(stderr, "Hash density (#identifiers per bucket): %f\n",
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NumIdentifiers/(double)NumBuckets);
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fprintf(stderr, "Ave identifier length: %f\n",
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(AverageIdentifierSize/(double)NumIdentifiers));
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fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength);
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// Compute statistics about the memory allocated for identifiers.
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HashTable.getAllocator().PrintStats();
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}
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//===----------------------------------------------------------------------===//
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// SelectorTable Implementation
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//===----------------------------------------------------------------------===//
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unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) {
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return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr());
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}
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namespace clang {
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/// MultiKeywordSelector - One of these variable length records is kept for each
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/// selector containing more than one keyword. We use a folding set
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/// to unique aggregate names (keyword selectors in ObjC parlance). Access to
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/// this class is provided strictly through Selector.
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class MultiKeywordSelector
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: public DeclarationNameExtra, public llvm::FoldingSetNode {
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MultiKeywordSelector(unsigned nKeys) {
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ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
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}
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public:
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// Constructor for keyword selectors.
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MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) {
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assert((nKeys > 1) && "not a multi-keyword selector");
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ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
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// Fill in the trailing keyword array.
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IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this+1);
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for (unsigned i = 0; i != nKeys; ++i)
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KeyInfo[i] = IIV[i];
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}
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// getName - Derive the full selector name and return it.
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std::string getName() const;
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unsigned getNumArgs() const { return ExtraKindOrNumArgs - NUM_EXTRA_KINDS; }
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typedef IdentifierInfo *const *keyword_iterator;
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keyword_iterator keyword_begin() const {
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return reinterpret_cast<keyword_iterator>(this+1);
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}
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keyword_iterator keyword_end() const {
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return keyword_begin()+getNumArgs();
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}
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IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
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assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
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return keyword_begin()[i];
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}
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static void Profile(llvm::FoldingSetNodeID &ID,
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keyword_iterator ArgTys, unsigned NumArgs) {
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ID.AddInteger(NumArgs);
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for (unsigned i = 0; i != NumArgs; ++i)
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ID.AddPointer(ArgTys[i]);
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}
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void Profile(llvm::FoldingSetNodeID &ID) {
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Profile(ID, keyword_begin(), getNumArgs());
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}
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};
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} // end namespace clang.
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unsigned Selector::getNumArgs() const {
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unsigned IIF = getIdentifierInfoFlag();
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if (IIF <= ZeroArg)
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return 0;
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if (IIF == OneArg)
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return 1;
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// We point to a MultiKeywordSelector.
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MultiKeywordSelector *SI = getMultiKeywordSelector();
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return SI->getNumArgs();
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}
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IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const {
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if (getIdentifierInfoFlag() < MultiArg) {
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assert(argIndex == 0 && "illegal keyword index");
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return getAsIdentifierInfo();
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}
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// We point to a MultiKeywordSelector.
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MultiKeywordSelector *SI = getMultiKeywordSelector();
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return SI->getIdentifierInfoForSlot(argIndex);
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}
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StringRef Selector::getNameForSlot(unsigned int argIndex) const {
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IdentifierInfo *II = getIdentifierInfoForSlot(argIndex);
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return II? II->getName() : StringRef();
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}
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std::string MultiKeywordSelector::getName() const {
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SmallString<256> Str;
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llvm::raw_svector_ostream OS(Str);
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for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) {
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if (*I)
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OS << (*I)->getName();
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OS << ':';
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}
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return OS.str();
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}
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std::string Selector::getAsString() const {
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if (InfoPtr == 0)
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return "<null selector>";
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if (getIdentifierInfoFlag() < MultiArg) {
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IdentifierInfo *II = getAsIdentifierInfo();
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// If the number of arguments is 0 then II is guaranteed to not be null.
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if (getNumArgs() == 0)
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return II->getName();
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if (!II)
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return ":";
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return II->getName().str() + ":";
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}
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// We have a multiple keyword selector.
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return getMultiKeywordSelector()->getName();
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}
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/// Interpreting the given string using the normal CamelCase
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/// conventions, determine whether the given string starts with the
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/// given "word", which is assumed to end in a lowercase letter.
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static bool startsWithWord(StringRef name, StringRef word) {
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if (name.size() < word.size()) return false;
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return ((name.size() == word.size() || !isLowercase(name[word.size()])) &&
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name.startswith(word));
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}
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ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) {
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IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
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if (!first) return OMF_None;
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StringRef name = first->getName();
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if (sel.isUnarySelector()) {
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if (name == "autorelease") return OMF_autorelease;
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if (name == "dealloc") return OMF_dealloc;
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if (name == "finalize") return OMF_finalize;
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if (name == "release") return OMF_release;
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if (name == "retain") return OMF_retain;
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if (name == "retainCount") return OMF_retainCount;
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if (name == "self") return OMF_self;
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}
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if (name == "performSelector") return OMF_performSelector;
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// The other method families may begin with a prefix of underscores.
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while (!name.empty() && name.front() == '_')
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name = name.substr(1);
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if (name.empty()) return OMF_None;
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switch (name.front()) {
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case 'a':
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if (startsWithWord(name, "alloc")) return OMF_alloc;
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break;
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case 'c':
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if (startsWithWord(name, "copy")) return OMF_copy;
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break;
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case 'i':
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if (startsWithWord(name, "init")) return OMF_init;
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break;
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case 'm':
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if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy;
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break;
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case 'n':
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if (startsWithWord(name, "new")) return OMF_new;
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break;
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default:
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break;
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}
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return OMF_None;
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}
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namespace {
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struct SelectorTableImpl {
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llvm::FoldingSet<MultiKeywordSelector> Table;
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llvm::BumpPtrAllocator Allocator;
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};
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} // end anonymous namespace.
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static SelectorTableImpl &getSelectorTableImpl(void *P) {
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return *static_cast<SelectorTableImpl*>(P);
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}
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/*static*/ Selector
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SelectorTable::constructSetterName(IdentifierTable &Idents,
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SelectorTable &SelTable,
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const IdentifierInfo *Name) {
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SmallString<100> SelectorName;
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SelectorName = "set";
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SelectorName += Name->getName();
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SelectorName[3] = toUppercase(SelectorName[3]);
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IdentifierInfo *SetterName = &Idents.get(SelectorName);
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return SelTable.getUnarySelector(SetterName);
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}
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size_t SelectorTable::getTotalMemory() const {
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SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
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return SelTabImpl.Allocator.getTotalMemory();
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}
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Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) {
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if (nKeys < 2)
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return Selector(IIV[0], nKeys);
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SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
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// Unique selector, to guarantee there is one per name.
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llvm::FoldingSetNodeID ID;
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MultiKeywordSelector::Profile(ID, IIV, nKeys);
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void *InsertPos = 0;
|
|
if (MultiKeywordSelector *SI =
|
|
SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos))
|
|
return Selector(SI);
|
|
|
|
// MultiKeywordSelector objects are not allocated with new because they have a
|
|
// variable size array (for parameter types) at the end of them.
|
|
unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *);
|
|
MultiKeywordSelector *SI =
|
|
(MultiKeywordSelector*)SelTabImpl.Allocator.Allocate(Size,
|
|
llvm::alignOf<MultiKeywordSelector>());
|
|
new (SI) MultiKeywordSelector(nKeys, IIV);
|
|
SelTabImpl.Table.InsertNode(SI, InsertPos);
|
|
return Selector(SI);
|
|
}
|
|
|
|
SelectorTable::SelectorTable() {
|
|
Impl = new SelectorTableImpl();
|
|
}
|
|
|
|
SelectorTable::~SelectorTable() {
|
|
delete &getSelectorTableImpl(Impl);
|
|
}
|
|
|
|
const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) {
|
|
switch (Operator) {
|
|
case OO_None:
|
|
case NUM_OVERLOADED_OPERATORS:
|
|
return 0;
|
|
|
|
#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
|
|
case OO_##Name: return Spelling;
|
|
#include "clang/Basic/OperatorKinds.def"
|
|
}
|
|
|
|
llvm_unreachable("Invalid OverloadedOperatorKind!");
|
|
}
|