Mangle.cpp revision 5f9e272e632e951b1efe824cd16acb4d96077930 
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
32using 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
37namespace {
38
39static 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
46static 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
62void MangleContext::mangleGlobalBlock(const BlockDecl *BD,
63                                      raw_ostream &Out) {
64  Out << "__block_global_" << getBlockId(BD, false);
65}
66
67void 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
78void 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
89void 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
115void 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
131void 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