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      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::mangleGlobalBlock(const BlockDecl *BD,
     63                                       raw_ostream &Out) {
     64   Out << "__block_global_" << getBlockId(BD, false);
     65 }
     66 
     67 void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD,
     68                                     CXXCtorType CT, const BlockDecl *BD,
     69                                     raw_ostream &ResStream) {
     70   checkMangleDC(CD, BD);
     71   llvm::SmallString<64> Buffer;
     72   llvm::raw_svector_ostream Out(Buffer);
     73   mangleCXXCtor(CD, CT, Out);
     74   Out.flush();
     75   mangleFunctionBlock(*this, Buffer, BD, ResStream);
     76 }
     77 
     78 void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD,
     79                                     CXXDtorType DT, const BlockDecl *BD,
     80                                     raw_ostream &ResStream) {
     81   checkMangleDC(DD, BD);
     82   llvm::SmallString<64> Buffer;
     83   llvm::raw_svector_ostream Out(Buffer);
     84   mangleCXXDtor(DD, DT, Out);
     85   Out.flush();
     86   mangleFunctionBlock(*this, Buffer, BD, ResStream);
     87 }
     88 
     89 void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD,
     90                                 raw_ostream &Out) {
     91   assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC));
     92   checkMangleDC(DC, BD);
     93 
     94   llvm::SmallString<64> Buffer;
     95   llvm::raw_svector_ostream Stream(Buffer);
     96   if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) {
     97     mangleObjCMethodName(Method, Stream);
     98   } else {
     99     const NamedDecl *ND = cast<NamedDecl>(DC);
    100     if (IdentifierInfo *II = ND->getIdentifier())
    101       Stream << II->getName();
    102     else {
    103       // FIXME: We were doing a mangleUnqualifiedName() before, but that's
    104       // a private member of a class that will soon itself be private to the
    105       // Itanium C++ ABI object. What should we do now? Right now, I'm just
    106       // calling the mangleName() method on the MangleContext; is there a
    107       // better way?
    108       mangleName(ND, Stream);
    109     }
    110   }
    111   Stream.flush();
    112   mangleFunctionBlock(*this, Buffer, BD, Out);
    113 }
    114 
    115 void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
    116                                          raw_ostream &Out) {
    117   llvm::SmallString<64> Name;
    118   llvm::raw_svector_ostream OS(Name);
    119 
    120   const ObjCContainerDecl *CD =
    121   dyn_cast<ObjCContainerDecl>(MD->getDeclContext());
    122   assert (CD && "Missing container decl in GetNameForMethod");
    123   OS << (MD->isInstanceMethod() ? '-' : '+') << '[' << CD->getName();
    124   if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(CD))
    125     OS << '(' << CID << ')';
    126   OS << ' ' << MD->getSelector().getAsString() << ']';
    127 
    128   Out << OS.str().size() << OS.str();
    129 }
    130 
    131 void MangleContext::mangleBlock(const BlockDecl *BD,
    132                                 raw_ostream &Out) {
    133   const DeclContext *DC = BD->getDeclContext();
    134   while (isa<BlockDecl>(DC) || isa<EnumDecl>(DC))
    135     DC = DC->getParent();
    136   if (DC->isFunctionOrMethod())
    137     mangleBlock(DC, BD, Out);
    138   else
    139     mangleGlobalBlock(BD, Out);
    140 }
    141