1 //===--- Mangle.cpp - Mangle C++ Names --------------------------*- 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 // Implements generic name mangling support for blocks and Objective-C. 11 // 12 //===----------------------------------------------------------------------===// 13 #include "clang/AST/Mangle.h" 14 #include "clang/AST/ASTContext.h" 15 #include "clang/AST/Decl.h" 16 #include "clang/AST/DeclCXX.h" 17 #include "clang/AST/DeclObjC.h" 18 #include "clang/AST/DeclTemplate.h" 19 #include "clang/AST/ExprCXX.h" 20 #include "clang/Basic/ABI.h" 21 #include "clang/Basic/SourceManager.h" 22 #include "llvm/ADT/StringExtras.h" 23 #include "llvm/Support/raw_ostream.h" 24 #include "llvm/Support/ErrorHandling.h" 25 26 #define MANGLE_CHECKER 0 27 28 #if MANGLE_CHECKER 29 #include <cxxabi.h> 30 #endif 31 32 using namespace clang; 33 34 // FIXME: For blocks we currently mimic GCC's mangling scheme, which leaves 35 // much to be desired. Come up with a better mangling scheme. 36 37 namespace { 38 39 static void mangleFunctionBlock(MangleContext &Context, 40 StringRef Outer, 41 const BlockDecl *BD, 42 raw_ostream &Out) { 43 Out << "__" << Outer << "_block_invoke_" << Context.getBlockId(BD, true); 44 } 45 46 static void checkMangleDC(const DeclContext *DC, const BlockDecl *BD) { 47 #ifndef NDEBUG 48 const DeclContext *ExpectedDC = BD->getDeclContext(); 49 while (isa<BlockDecl>(ExpectedDC) || isa<EnumDecl>(ExpectedDC)) 50 ExpectedDC = ExpectedDC->getParent(); 51 // In-class initializers for non-static data members are lexically defined 52 // within the class, but are mangled as if they were specified as constructor 53 // member initializers. 54 if (isa<CXXRecordDecl>(ExpectedDC) && DC != ExpectedDC) 55 DC = DC->getParent(); 56 assert(DC == ExpectedDC && "Given decl context did not match expected!"); 57 #endif 58 } 59 60 } 61 62 void MangleContext::anchor() { } 63 64 void MangleContext::mangleGlobalBlock(const BlockDecl *BD, 65 raw_ostream &Out) { 66 Out << "__block_global_" << getBlockId(BD, false); 67 } 68 69 void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD, 70 CXXCtorType CT, const BlockDecl *BD, 71 raw_ostream &ResStream) { 72 checkMangleDC(CD, BD); 73 SmallString<64> Buffer; 74 llvm::raw_svector_ostream Out(Buffer); 75 mangleCXXCtor(CD, CT, Out); 76 Out.flush(); 77 mangleFunctionBlock(*this, Buffer, BD, ResStream); 78 } 79 80 void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD, 81 CXXDtorType DT, const BlockDecl *BD, 82 raw_ostream &ResStream) { 83 checkMangleDC(DD, BD); 84 SmallString<64> Buffer; 85 llvm::raw_svector_ostream Out(Buffer); 86 mangleCXXDtor(DD, DT, Out); 87 Out.flush(); 88 mangleFunctionBlock(*this, Buffer, BD, ResStream); 89 } 90 91 void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD, 92 raw_ostream &Out) { 93 assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC)); 94 checkMangleDC(DC, BD); 95 96 SmallString<64> Buffer; 97 llvm::raw_svector_ostream Stream(Buffer); 98 if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) { 99 mangleObjCMethodName(Method, Stream); 100 } else { 101 const NamedDecl *ND = cast<NamedDecl>(DC); 102 if (IdentifierInfo *II = ND->getIdentifier()) 103 Stream << II->getName(); 104 else { 105 // FIXME: We were doing a mangleUnqualifiedName() before, but that's 106 // a private member of a class that will soon itself be private to the 107 // Itanium C++ ABI object. What should we do now? Right now, I'm just 108 // calling the mangleName() method on the MangleContext; is there a 109 // better way? 110 mangleName(ND, Stream); 111 } 112 } 113 Stream.flush(); 114 mangleFunctionBlock(*this, Buffer, BD, Out); 115 } 116 117 void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD, 118 raw_ostream &Out) { 119 SmallString<64> Name; 120 llvm::raw_svector_ostream OS(Name); 121 122 const ObjCContainerDecl *CD = 123 dyn_cast<ObjCContainerDecl>(MD->getDeclContext()); 124 assert (CD && "Missing container decl in GetNameForMethod"); 125 OS << (MD->isInstanceMethod() ? '-' : '+') << '[' << CD->getName(); 126 if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(CD)) 127 OS << '(' << *CID << ')'; 128 OS << ' ' << MD->getSelector().getAsString() << ']'; 129 130 Out << OS.str().size() << OS.str(); 131 } 132 133 void MangleContext::mangleBlock(const BlockDecl *BD, 134 raw_ostream &Out) { 135 const DeclContext *DC = BD->getDeclContext(); 136 while (isa<BlockDecl>(DC) || isa<EnumDecl>(DC)) 137 DC = DC->getParent(); 138 if (DC->isFunctionOrMethod()) 139 mangleBlock(DC, BD, Out); 140 else 141 mangleGlobalBlock(BD, Out); 142 } 143